Measurement invariance with respect to ethnicity of the Patient Health Questionnaire-9 (PHQ-9)

The universality of anxiety experiences between Germany, Indonesia, and the US: A measurement invariance analysis

BACKGROUND

Generalized Anxiety Disorder-7 (GAD-7) is a widely used self-report that assesses generalized anxiety disorder symptomatology. Whilst previous studies have reported good-to-excellent psychometric properties across different languages, it remains unclear whether GAD-7 measures the same construct across Western and non-Western countries. Here, we tested the hypothesis that the GAD-7 is measurement invariant across Western and non-Western countries and the hypothesis that a less severe GAD symptomatology can be found in non-Western countries.

METHODS

The present study employed an online survey to examine the GAD-7's measurement invariance (MI) across community samples from Indonesia, Germany, and the USA (N = 2350). MI was computed using multiple-group confirmatory factor analyses with a general factor model of the GAD-7.

RESULTS

The general factor of the GAD-7 had good model fit and configural, metric, scalar, and residual MI across the three countries. No significant differences were found in mean scores (Indonesia, M = 1.78, SD = 0.64, Germany, M = 1.84, SD = 0.69, USA, M = 1.87, SD = 0.79; F (2, 1514) = 3.079, p = 0.046; Games-Howell post-hoc analysis, tGermany-Indonesia = 1.720, p = 0.199; tGermany-USA = 0.750, p = 0.734; tIndonesia-USA = 2.330, p = 0.053).

LIMITATIONS

This study's online nature may have inflated cross-country similarities and reduced data generalizability.

CONCLUSION

The full MI demonstrates the GAD-7 captures the same GAD construct across Western and non-Western countries. Inconsistent with the previous findings GAD severity levels were similar across countries. Despite some possible reservations, the GAD-7 appears to be a culturally fair GAD measure.

Income rank and depressive symptoms among employees in Germany - A 5-year cross-lagged panel analysis

Background/Objective

Socioeconomic disparities in mental health are well-established. Previous research suggests that relative income rank is associated with depressive symptoms above and beyond absolute income. This study aimed to investigate the predictive value of income rank for future depressive symptoms while accounting for absolute income. Exploring potential reverse pathways from depressive symptoms to income rank was a secondary objective.

Method

A two-wave cross-lagged panel design with a 5-year follow-up was used to analyze data for income rank, absolute income, and two dimensions of depressive symptoms (i.e., cognitive-affective and somatic symptoms) from initially 4,201 employees. Income rank was calculated for reference groups, based on the same gender, the same 5-year age band, and the same occupational skill level.

Results

Lower income rank at baseline predicted a higher severity of cognitive-affective depressive symptoms at five-year follow-up, even after adjusting for absolute income. In contrast, income rank did not demonstrate a significant unique longitudinal association with somatic depressive symptoms when simultaneously taking absolute income into account. There was no evidence for the assumption that depressive symptoms are predictive for future income rank (i.e., reverse pathway).

Conclusions

Cognitive-affective symptoms of depression might be particularly responsive to social comparisons and a relatively low social rank.

Feeling too low to be active: Physical inactivity mediates the relationship between mental and physical health

BACKGROUND

Physical inactivity is one of the most influential and pervasive risk factors for health problems. Therefore, public health experts call for interventions to promote physical activity across the lifespan. This study aimed to examine the role of mental health in physical inactivity and the subsequent role of physical activity in various aspects of physical health.

METHODS

Data were collected in the third wave of the European Health Interview Survey (EHIS) in Slovenia. A nationally representative sample of 9,900 people (49.6% male) aged 15 years or more (M = 49.2; SD = 18.9 years) provided self-reports on depression (PHQ-8), subjective well-being (MHC-SF), physical (in)activity, bodily pain, long-standing activity limitations, their general health status, and possible chronic diseases.

RESULTS

The results of a path analysis showed that depression had a positive effect and well-being had a negative effect on physical inactivity, which in turn contributed to the likelihood of severe bodily pain, activity limitations, poor self-rated health, and multimorbidity. Depression and well-being contributed to health-related outcomes directly and indirectly through physical inactivity.

LIMITATIONS

Because of the cross-sectional design, this study is limited in its ability to draw causal conclusions. All health data were self-reported.

CONCLUSIONS

Results suggest that high levels of depression and low levels of subjective well-being may be an early warning sign of physical health problems. Interventions aimed at preventing or reducing mental health problems and promoting positive mental health may benefit not only mental health per se, but also prevent physical inactivity and, consequently, physical health problems.

Symptom clustering of major depression in a national telehealth sample

BACKGROUND

Major depressive disorder (MDD) is a heterogeneous disorder whose possible symptom combinations have not been well delineated. The aim of this study was to explore the heterogeneity of symptoms experienced by those with MDD to characterize phenotypic presentations.

METHODS

Cross-sectional data (N = 10,158) from a large telemental health platform were used to identify subtypes of MDD. Symptom data, gathered from both clinically-validated surveys and intake questions, were analyzed via polychoric correlations, principal component analysis, and cluster analysis.

RESULTS

Principal components analysis (PCA) of baseline symptom data revealed 5 components, including anxious distress, core emotional, agitation/irritability, insomnia, and anergic/apathy components. PCA-based cluster analysis resulted in four MDD phenotypes, the largest of which was characterized by a prominent elevation on the anergic/apathy component, but also core emotional. The four clusters differed on demographic and clinical characteristics.

LIMITATIONS

The primary limitation of this study is that the phenotypes uncovered are limited by the questions asked. These phenotypes will need to be cross validated with other samples, potentially expanded to include biological/genetic variables, and followed longitudinally.

CONCLUSIONS

The heterogeneity in MDD, as illustrated by the phenotypes in this sample, may explain the heterogeneity of treatment response in large-scale treatment trials. These phenotypes can be used to study varying rates of recovery following treatment and to develop clinical decision support tools and artificial intelligence algorithms. Strengths of this study include its size, breadth of included symptoms, and novel use of a telehealth platform.

Measurement invariance of the PHQ-9 and GAD-7 across males and females seeking treatment for common mental health disorders

BACKGROUND

The nine-item Patient Health Questionnaire (PHQ-9) and the seven-item Generalised Anxiety Disorder scale (GAD-7) scales are routinely used in research and clinical practice. Whilst measurement invariance of these measures across gender has been demonstrated individually in general population studies and clinical samples, less is known about invariance of the distinct but correlated latent factors ('depression' and 'anxiety'). The current study assessed measurement invariance of these constructs across males and females seeking treatment for common mental health disorders.

METHODS

Data were provided from eight psychological treatment services in London, England. Data from initial assessments with the services where individual items on the PHQ-9 and GAD-7 were available were included in analyses. Measurement invariance was explored across self-identified genders, with 'male' and 'female' categories available in the dataset. Sensitivity analyses were conducted using propensity score matching on sociodemographic and clinical variables.

RESULTS

Data were available for 165,872 patients (110,833 females, 55,039 males). There was evidence of measurement invariance between males and females in both the full sample and a propensity score matched sample (n = 46,249 in each group).

CONCLUSIONS

Measurement invariance of the correlated depression and anxiety factors of PHQ-9 and GAD-7 were indicated in this sample of individuals seeking psychological treatment for CMHDs. These results support the use of these measures in routine clinical practice for both males and females. This is of particular importance for assessing the prevalence of clinically significant levels of symptoms as well as comparing treatment outcomes across genders.

Factor structure of the patient health questionnaire-9 and measurement invariance across gender and age among Chinese university students

The Patient Health Questionnaire-9 (PHQ-9) has been widely used to screen depression symptoms. The present research aimed to assess the reliability and validity of PHQ-9, besides measurement invariance of the PHQ-9 across gender and age among Chinese university students. A total of 12,957 Chinese college students from 2 universities in Henan and Hainan provinces (China) completed the questionnaires via WeChat. This research reported the psychometric properties of PHQ-9 and measurement invariance of the PHQ-9 across gender and age among Chinese university students. Compared with 1-factor model, the 2-factor (affective factor and somatic factor) model of PHQ-9 showed a better fit index in Chinese university students. Without the last 2 items, the 2-factor model of the PHQ-9 showed satisfactory reliability, validity, and good fit index (e.g., Root mean square error of approximation = 0.060, Goodness-of-fit index = 0.982, Comparative fit index = 0.986, and Tucker-Lewis index = 0.974). The Cronbach's alpha of PHQ-9 was 0.874. Multi-group analysis across gender and age demonstrated that measurement equivalency for the 2-factor model of the PHQ-9 was established (e.g., Root mean square error of approximation < 0.08, Comparative fit index > 0.90 and Tucker-Lewis index > 0.90). The 2-factor model of the PHQ-9 without the items of "movement" and "desire to die" showed a better fit index in Chinese university students. The measurement equivalence across gender and age for the 2-factor model of the PHQ-9 can be established among Chinese university students.

Measurement invariance of the Multidimensional Depression Assessment Scale (MDAS) across gender and ethnic groups of Asian, Caucasian, Black, and Hispanic

BACKGROUND

Major Depressive Disorder is a severe and highly disabling mental illness. Almost all self-reported questionnaires have overlooked the interpersonal symptoms of depression which are important across gender and culture. The Multidimensional Depression Assessment Scale (MDAS) developed by Cheung and Power (2012) entails comprehensive emotional, cognitive, somatic, and interpersonal subscales. It addresses the criticism that existing self-report depression scales might not cover sufficient phenomenological heterogeneity of depression. The current study aimed to evaluate the psychometric properties of the MDAS across gender and four major ethnic groups of Caucasian, Black, Asian and Hispanic, including reliability and concurrent validity against the Centre for Epidemiological Studies Depression Scale (CESD) and Patients Health Questionnaire (PHQ-9). It also aimed to establish a stable factor structure across gender and ethnic groups and test the measurement invariance to enhance its potential for clinical use.

METHODS

A community sample of 3499 participants from four ethnic groups were recruited via online crowdsourcing sites of Qualtrics and Amazon M Turk. Each individual completed a demographic questionnaire, the MDAS, CESD and PHQ-9.

RESULTS

There was good internal consistency (Cronbach's alpha >0.90) and concurrent reliability across gender and ethnic groups. Strict measurement invariance was established for MDAS over a four-factor factor structure corresponding to the four subscales.

CONCLUSIONS

The MDAS showed good psychometric properties and measurement invariance of a four-factor structure, suggesting its potential to be used in clinical settings across gender and ethnic groups.

LIMITATIONS

Participants all answered the questionnaires in English, which could hinder cultural variations in their expression of symptoms.

Measuring Positive Mental Health and Depression in Africa: A Variable-Based and Person-Centred Analysis of the Dual-Continua Model

The dual-continua model of mental health provides a contemporary framework for conceptualising and operationalising mental health. According to this model, mental health is distinct from but related to mental illness, and not the opposite or merely the absence of psychopathology symptoms. To examine the validity of the dual-continua model, previous studies have either applied variable-based analysis such as confirmatory factor analysis (CFA), or used predetermined cut-off points for subgroup division. The present study extends this contribution by subjecting data from an African sample to both CFA and latent class analysis (LCA) to test the dual-continua model in Africa. We applied CFA separately for the Mental Health Continuum—Short Form (MHC-SF) and Patient Health Questionnaire—9 (PHQ-9); and LCA on combined item responses. College students (N = 892; average age = 22.74, SD = 4.92; female = 58%) from Ghana (n = 309), Kenya (n = 262), Mozambique (n = 232), and South Africa (n = 89) completed the MHC-SF and PHQ-9. With minor modifications to the measurement models, the CFA results of this study confirm the three-factor structure of the MHC-SF, and a unidimensional solution for the PHQ-9. LCA results show the presence of three distinct latent classes: languishing with moderate endorsement of depressive symptoms (25.9%), flourishing with low endorsement of depressive symptoms (63.7%), and moderate mental health with high endorsement of depressive symptoms (10.4%). These findings further contribute to affirming the evidence for the dual-continua model of mental health, with implications for the assessment of mental health, to inform policy, practise, and future research in community and clinical settings in Africa.

Comparing psychotic experiences in low-and-middle-income-countries and high-income-countries with a focus on measurement invariance

BACKGROUND

The prevalence of psychotic experiences (PEs) is higher in low-and-middle-income-countries (LAMIC) than in high-income countries (HIC). Here, we examine whether this effect is explicable by measurement bias.

METHODS

A community sample from 13 countries (N = 7141) was used to examine the measurement invariance (MI) of a frequently used self-report measure of PEs, the Community Assessment of Psychic Experiences (CAPE), in LAMIC (n = 2472) and HIC (n = 4669). The CAPE measures positive (e.g. hallucinations), negative (e.g. avolition) and depressive symptoms. MI analyses were conducted with multiple-group confirmatory factor analyses.

RESULTS

MI analyses showed similarities in the structure and understanding of the CAPE factors between LAMIC and HIC. Partial scalar invariance was found, allowing for latent score comparisons. Residual invariance was not found, indicating that sum score comparisons are biased. A comparison of latent scores before and after MI adjustment showed both overestimation (e.g. avolition, d = 0.03 into d = -0.42) and underestimation (e.g. magical thinking, d = -0.03 into d = 0.33) of PE in LAMIC relative to HIC. After adjusting the CAPE for MI, participants from LAMIC reported significantly higher levels on most CAPE factors but a significantly lower level of avolition.

CONCLUSION

Previous studies using sum scores to compare differences across countries are likely to be biased. The direction of the bias involves both over- and underestimation of PEs in LAMIC compared to HIC. Nevertheless, the study confirms the basic finding that PEs are more frequent in LAMIC than in HIC.

Revisiting the theoretical and methodological foundations of depression measurement

Depressive disorders are among the leading causes of global disease burden, but there has been limited progress in understanding the causes and treatments for these disorders. In this Perspective, we suggest that such progress crucially depends on our ability to measure depression. We review the many problems with depression measurement, including limited evidence of validity and reliability. These issues raise grave concerns about common uses of depression measures, such as diagnosis or tracking treatment progress. We argue that shortcomings arise because depression measurement rests on shaky methodological and theoretical foundations. Moving forward, we need to break with the field's tradition that has, for decades, divorced theories about depression from how we measure it. Instead, we suggest that epistemic iteration, an iterative exchange between theory and measurement, provides a crucial avenue for depression measurement to progress.

Sex Differences in Depression and Anxiety Symptoms: Measurement Invariance, Prevalence, and Symptom Heterogeneity Among University Students in South Africa

Adequate measurement is an essential component of the assessment of mental health disorders and symptoms such as depression and anxiety. The present study investigated sex-specific differences in the Patient Health Questionnaire-9 (PHQ-9) and Generalized Anxiety Disorder-7 (GAD-7). This comprehensive cross-sectional design study pursued four objectives: measurement invariance of PHQ-9 and GAD-7 between male and female; depression and anxiety prevalence differences; cross-sex differences in the relationship between depression and anxiety; and a comparison of symptom heterogeneity. A sample of 1966 (male = 592; female = 1374; mean age = 21 years) students from South Africa completed the PHQ-9 and the GAD-7. Data analyses for measurement invariance, latent class analysis, inter-variable correlations and group comparisons were conducted in Mplus. The two-dimensional PHQ-9 achieved scalar invariance, while the GAD-7 yielded metric invariance. The somatic and non-somatic latent dimensions of depression were compared and showed no significant difference between male and female groups. The positive relationship between depression and anxiety was also not significantly different between the two groups. While the PHQ-9 symptoms formed three classes in the male group, and four classes in the female group, the GAD-7 had the same number of classes (three) and a similar pattern between the two groups. These findings hold implications for the measurement, assessment and understanding of symptom manifestation and distribution, as well as the treatment of depression and anxiety in South Africa.

The effects of survey mode on self-reported psychological functioning: Measurement invariance and latent mean comparison across face-to-face and web modes

Despite the increasing popularity of mixed-mode approaches to data collection, studies examining measurement equivalence across different survey modes in representative samples of the general population, particularly focusing on measures of socially sensitive psychological constructs, are sparse. In this study, we used data from a large representative sample of the Slovenian population (N = 9,900) collected as part of the third wave of the European Health Interview Survey (EHIS) to examine mode-inherent effects (i.e., measurement effects that cannot be neutralized by clever survey design) of the traditional interviewer-mediated face-to-face mode and the increasingly popular self-administered web mode on three measures of psychological functioning, namely the Patient Health Questionnaire Depression Scale (PHQ-8), the Satisfaction with Life Scale (SWLS), and the Mental Health Continuum - Short Form (MHC-SF). After controlling for self-selection propensities, our results showed strict measurement invariance for all three scales across the two survey modes, but statistically significant and notable differences in latent means, suggesting that individuals who respond face-to-face systematically report better psychological functioning than individuals who respond over the web. These results suggest significant mode inherent effects that cannot be attributed to measurement non-invariance of the scales between face-to-face and web survey modes, but most likely to social desirability bias in responses achieved in the presence of an interviewer. Administration mode effects must be considered when interpreting and comparing results obtained through different survey modes, particularly interviewer-mediated versus self-administered modes, especially when using measures of culturally desirable traits and behaviors, such as mental health and well-being.

Psychometric Properties and Factor Structure of the Patient Health Questionnaire-9 as a Screening Tool for Depression Among Ecuadorian College Students

Background

The Patient Health Questionnaire-9 (PHQ-9) is the most well-known self-report measure to screen for depressive symptomatology, although discerning which is the factor structure that represents the best fit remains a challenge.

Objective

The aim of this study was to analyze the psychometric properties and factorial structure of the Spanish version of the PHQ-9 in a large sample of Ecuadorian college students.

Methods

A total of 5,394 students (M = 22.03 years; SD = 3.05; 54.8% female) from three Ecuadorian universities were surveyed using a computerized questionnaire within a 4-week assessment period. The PHQ-9 was tested for factorial structure, reliability, and correlations with other mental health-related measures.

Results

The hierarchical model that included a general factor and three nested factors had a better fit, and such a hierarchical structure remained invariant across sex and age. Total omega value (ω) was 0.90 for the total scale and hierarchical omega values (ωh) were 0.68 for the general factor, as well as 0.34, 0.38, and 0.44 for the respective nested factors (somatic, cognitive/affective, concentration/motor). Moreover, PHQ-9 scores were significantly higher among women, although effect sizes of comparison of those sex differences were very small. Finally, the PHQ-9 scores correlated with multiple mental health indicators (psychological inflexibility, loneliness, stress, and satisfaction with life).

Discussion

The Spanish version of the PHQ-9 showed good psychometric properties among Ecuadorian college students. The hierarchical structure showed the best fit for the data, including not only a dominant general factor, but also the somatic, cognitive/affective and concentration/motor subcomponents. In conclusion, the PHQ-9 tool seems to represent an easy-to-implement screening questionnaire to design preventive programs for those Ecuadorian college students at risk of developing depressive disorders.

Factorial Validity and Invariance of an Adolescent Depression Symptom Screening Tool

CONTEXT

Depression is among the most common mental health disorder in youth, results in significant impairment, and is associated with a higher risk of suicide. Screening is essential but assessment tools may not be appropriate across races or do not account for the complex interrelatedness of various demographics including gender, socio-economic status and race.

OBJECTIVES

(1) To determine the factor structure of the Patient Health Questionnaire-Adolescent (PHQ-A) for measuring depression in a group of adolescent athletes; and (2) to determine measurement invariance between Blacks and Whites on the PHQ-A.

DESIGN

Retrospective cohort design.

SETTING

Data obtained from a secure database collected at a free, comprehensive, mass pre-participation physical exam (PPE) event hosted by a large health care system.

PARTICIPANTS

Participants included 683 high school athletes (Black n=416; White n=267). Independent variables included somatic and affective factors contributing to the construct of depression measured by the PHQ-A and participant race (Black and White).

MAIN OUTCOME MEASURES

(1) Factors upon which the construct of depression is measured and (2) measurement invariance between Blacks and Whites.

RESULTS

A two-factor model, including affective and somatic components, was specified and exhibited an adequate fit to the data (CFI> .90). All items exhibited moderate to high squared multiple correlation values (R2 = .10-.65), suggesting that these items resonated relatively well with participants. The two-factor model demonstrated noninvariance Black and White participants (RMSEA = .06-.08).

CONCLUSIONS

Overall, the structure of the PHQ-A is supported by a two-factor model in adolescent athletes, measuring both affective and somatic symptoms of depression. A two factor PHQ-A structure is not fully invariant for the adolescents sampled across participant groups, implying that the model functions differently between Blacks and Whites sampled.

Measurement invariance testing of the patient health questionnaire-9 (PHQ-9) across people with and without diabetes mellitus from the NHANES, EMHS and UK Biobank datasets

BACKGROUND

The prevalence of depression is higher among those with diabetes than in the general population. The Patient Health Questionnaire (PHQ-9) is commonly used to assess depression in people with diabetes, but measurement invariance of the PHQ-9 across groups of people with and without diabetes has not yet been investigated.

METHODS

Data from three independent cohorts from the USA (n=1,886 with diabetes, n=4,153 without diabetes), Quebec, Canada (n= 800 with diabetes, n= 2,411 without diabetes), and the UK (n=4,981 with diabetes, n=145,570 without diabetes), were used to examine measurement invariance between adults with and without diabetes. A series of multiple group confirmatory factor analyses were performed, with increasingly stringent model constraints applied to assess configural, equal thresholds, and equal thresholds and loadings invariance, respectively. One-factor and two-factor (somatic and cognitive-affective items) models were examined.

RESULTS

Results demonstrated that the most stringent models, testing equal loadings and thresholds, had satisfactory model fit in the three cohorts for one-factor models (RMSEA = .063 or below and CFI = .978 or above) and two-factor models (RMSEA = .042 or below and CFI = .989 or above).

LIMITATIONS

Data were from Western countries only and we could not distinguish between type of diabetes.

CONCLUSIONS

Results provide support for measurement invariance between groups of people with and without diabetes, using either a one-factor or a two-factor model. While the two-factor solution has a slightly better fit, the one-factor solution is more parsimonious. Depending on research or clinical needs, both factor structures can be used.

Editorial Perspective: Prescribing measures: unintended negative consequences of mandating standardized mental health measurement

In July 2020, two of the largest funders of mental health research worldwide - the National Institute of Mental Health (NIMH) and the Wellcome Trust - announced plans to standardize mental health measurement. Specifically, obtaining funding for research related to depression and anxiety will be conditional on using four specific measures. While we agree that there are obvious benefits to standardizing mental health measurement, some of which are discussed in the announcement by NIMH and Wellcome, here we focus on potential unintended negative consequences of this initiative: Lacking transferability across settings: scales were developed for specific settings (e.g. community, clinic) and purposes (e.g. intervention studies), and their properties might not be easily transferable between settings. Narrowing the scope of inquiry: individuals experience mental health difficulties in wide-ranging ways, and the narrow scope of the proposed scales risks limiting important insights for research and treatments. Lowering the threshold for robust evidence: empirical findings limited to a specific imperfect measure are less robust than if such evidence is (re)produced across multiple scales. Creating a two-tiered mental health science: arbitrarily conferring gold standard status on some imperfect measures over others will create an artificial two-tiered system leading to an impoverishment of mental health research. Recommendations for mitigating these negative consequences include the following: mandating a wider set of measures that have been validated for specific populations and research purposes, funding research assessing the measurement properties of scales across settings and purposes, stressing the limitations of mandated measures to avoid en masse application and replacement of measures across studies and health systems and creating speed bumps to ensure that any widespread adoption of mandated measures does not result in impoverishment of mental health science.

Development and validation of the Maudsley Modified Patient Health Questionnaire (MM-PHQ-9)

BACKGROUND

The Patient Health Questionnaire-9 (PHQ-9) is a widely used measure of depression in primary care. It was, however, originally designed as a diagnostic screening tool, and not for measuring change in response to antidepressant treatment. Although the Quick Inventory of Depressive Symptomology (QIDS-SR-16) has been extensively validated for outcome measurement, it is poorly adopted in UK primary care, and, although free for clinicians, has licensing restrictions for healthcare organisation use.

AIMS

We aimed to develop a modified version of the PHQ-9, the Maudsley Modified PHQ-9 (MM-PHQ-9), for tracking symptom changes in primary care. We tested the measure's validity, reliability and factor structure.

METHOD

A sample of 121 participants was recruited across three studies, and comprised 78 participants with major depressive disorder and 43 controls. MM-PHQ-9 scores were compared with the QIDS-SR-16 and Clinical Global Impressions improvement scale, for concurrent validity. Internal consistency of the scale was assessed, and principal component analysis was conducted to determine the items' factor structure.

RESULTS

The MM-PHQ-9 demonstrated good concurrent validity with the QIDS-SR-16, and excellent internal consistency. Sensitivity to change over a 14-week period was d = 0.41 compared with d = 0.61 on the QIDS-SR-16. Concurrent validity between the paper and mobile app versions of the MM-PHQ-9 was r = 0.67.

CONCLUSIONS

These results indicate that the MM-PHQ-9 is a valid and reliable measure of depressive symptoms in paper and mobile app format, although further validation is required. The measure was sensitive to change, demonstrating suitability for use in routine outcome assessment.

Evaluating the Cross-Cultural Measurement Invariance of the PHQ-9 between American Indian/Alaska Native Adults and Diverse Racial and Ethnic Groups

BACKGROUND

The Patient Health Questionnaire-9 (PHQ-9), a self-reported depression screening instrument for measurement-based care (MBC), may have cross-cultural measurement invariance (MI) with a regional group of American Indian/Alaska Native (AI/AN) and non-Hispanic White adults. However, to ensure health equity, research was needed on the cross-cultural MI of the PHQ-9 between other groups of AI/AN peoples and diverse populations.

METHODS

We assessed the MI of the one-factor PHQ-9 model and five previously identified two-factor models between non-Hispanic AI/AN adults (ages 18-64) from healthcare systems A (n=1,759) and B (n=2,701) using secondary data and robust maximum likelihood estimation. We then tested either fully or partially invariant models for MI between either combined or separate AI/AN groups, respectively, and Hispanic (n=7,974), White (n=7,974), Asian (n=6,988), Black (n=6,213), and Native Hawaiian/Pacific Islander (n=1,370) adults from healthcare system B. All had mental health or substance use disorder diagnoses and were seen in behavioral health or primary care from 1/1/2009-9/30/2017.

RESULTS

The one-factor PHQ-9 model was partially invariant, with two-factor models partially, or in one case fully, invariant between AI/AN groups. The one-factor model and three two-factor models were partially invariant between all seven groups, while a two-factor model was fully invariant and another partially invariant between a combined AI/AN group and other racial and ethnic groups.

CONCLUSIONS

Achieving health equity in MBC requires ensuring the cross-cultural validity of measurement tools. Before comparing mean scores, PHQ-9 models should be assessed for individual racial and ethnic group fit for adults with mental health or substance use disorders.

Comparison of different scoring methods based on latent variable models of the PHQ-9: an individual participant data meta-analysis

BACKGROUND

Previous research on the depression scale of the Patient Health Questionnaire (PHQ-9) has found that different latent factor models have maximized empirical measures of goodness-of-fit. The clinical relevance of these differences is unclear. We aimed to investigate whether depression screening accuracy may be improved by employing latent factor model-based scoring rather than sum scores.

METHODS

We used an individual participant data meta-analysis (IPDMA) database compiled to assess the screening accuracy of the PHQ-9. We included studies that used the Structured Clinical Interview for DSM (SCID) as a reference standard and split those into calibration and validation datasets. In the calibration dataset, we estimated unidimensional, two-dimensional (separating cognitive/affective and somatic symptoms of depression), and bi-factor models, and the respective cut-offs to maximize combined sensitivity and specificity. In the validation dataset, we assessed the differences in (combined) sensitivity and specificity between the latent variable approaches and the optimal sum score (⩾10), using bootstrapping to estimate 95% confidence intervals for the differences.

RESULTS

The calibration dataset included 24 studies (4378 participants, 652 major depression cases); the validation dataset 17 studies (4252 participants, 568 cases). In the validation dataset, optimal cut-offs of the unidimensional, two-dimensional, and bi-factor models had higher sensitivity (by 0.036, 0.050, 0.049 points, respectively) but lower specificity (0.017, 0.026, 0.019, respectively) compared to the sum score cut-off of ⩾10.

CONCLUSIONS

In a comprehensive dataset of diagnostic studies, scoring using complex latent variable models do not improve screening accuracy of the PHQ-9 meaningfully as compared to the simple sum score approach.

The factor structure of depressive symptoms in patients with obesity enrolled in the RAINBOW clinical trial

BACKGROUND

Examining variability in the presenting symptoms of depression may be particularly important in characterizing depression in patients with comorbid conditions such as obesity. Identifying the underlying constructs of depression in such patients may produce phenotypic information to aid diagnosis and treatment decisions.

OBJECTIVE

To examine the latent factors of symptoms using the depression Symptom Checklist (SCL-20) and the Patient Health Questionnaire (PHQ-9), separately, in patients with obesity and elevated depressive symptoms.

METHODS

Exploratory factor analysis (EFA) was performed on baseline data from 409 patients with obesity and elevated depressive symptoms recruited in primary care. Bootstrap analysis was performed to estimate the precision and potential replicability of identified latent factors.

RESULTS

Participants (70% women, mean age of 51.0 ± 12.1 years) had moderate depression. EFA of the SCL-20 suggested two reliable factors: dysphoric mood (71% of the variance) and anhedonia (15% of the variance). EFA of the PHQ-9 yielded one factor: dysphoric mood (87% of the variance). Bootstrapped results supported the replicability of these results. The top most endorsed symptoms were feeling low energy, overeating and disturbed sleep.

LIMITATIONS

The generalizability of these findings to severe depression may be limited.

CONCLUSIONS

Patients with elevated depressive symptoms and obesity present with heterogeneous symptoms. The SCL-20 seems more sensitive than the PHQ-9 for differentiating symptom profiles in this population. Some possible reasons include: 1) differences in number of scale items, and 2) differences in the aspects of depression they tap into; the SCL-20 measures the severity of symptoms, whereas the PHQ-9 measures the frequency of symptoms.

Systematic review of the factor structure and measurement invariance of the patient health questionnaire-9 (PHQ-9) and validation of the Portuguese version in community settings

BACKGROUND

This research sought to review studies that examined the factor structure of the PHQ-9 using a confirmatory factor analysis approach (Study 1); to review studies that tested the measurement invariance of the PHQ-9 (Study 2); to examine the psychometric properties of the European Portuguese version in the general population (Study 3).

METHODS

Using PRISMA guidelines, a search was performed on Web of Science, PsycINFO, and Scopus from 2001 to August 2019. Assessment of eligibility criteria and data extraction were conducted by two independent researchers (Studies 1 and 2). In Study 3, data were collected from 1479 Portuguese adults, using a cross-sectional design. The BDI-II and the GDS-15 were administered to examine convergent validity.

RESULTS

The systematic review identified four-factor models of the PHQ-9 (Study 1). Nineteen studies supported a one-factor model, whereas 12 found evidence for a two-factor model. Both models were supported in general, clinical, psychiatric, and international samples. Study 2 identified ten studies that examined PHQ-9 measurement invariance across 18 groups. The PHQ-9 measurement invariance was fully supported across studies. Study 3 revealed that a two-factor model showed a close fit to data in the European Portuguese version of the PHQ-9. Measurement invariance, reliability, and convergent and divergent validity were also established.

LIMITATIONS

Study 3 did not include a gold standard measure of depression to evaluate PHQ-9 diagnostic properties.

CONCLUSIONS

Conceptual implications of the findings are discussed, and recommendations for using the Portuguese version of the PHQ-9 as a screening measure in community settings are also highlighted.

Are comparisons of mental disorders between Chinese and German students possible? An examination of measurement invariance for the PHQ-15, PHQ-9 and GAD-7

BACKGROUND

The Patient Health Questionnaire (PHQ) is one of the most commonly used instruments to assess mental disorders. However, research on its cross-cultural measurement invariance is not yet sufficient. This study examined the measurement invariance of the Chinese and German versions of the PHQ's somatic symptom severity scale (PHQ-15), depressive symptom severity scale (PHQ-9) and seven-item Generalized Anxiety Disorder (GAD-7) scale as a prerequisite for their use in cross-cultural comparisons.

METHODS

We used online data collected from groups of Chinese students in China (n = 413) and German students in Germany (n = 416). Separate measurement models for each group were examined using confirmatory factor analysis and measurement invariance testing was conducted to test the cross-cultural equivalence.

RESULTS

Findings demonstrated that the PHQ-9 and GAD-7 had partial scalar measurement invariance, but the cross-cultural measurement invariance of the PHQ-15 could not be confirmed. Comparisons of latent means did not indicate differences in the levels of depression and anxiety symptoms between Chinese and German samples.

CONCLUSION

The PHQ-9 and GAD-7 can be used in cross-cultural comparison of prevalence, but the intercultural use of PHQ-15 is more problematic. Findings are discussed from intercultural and methodological perspectives.

Establishing reliability and validity for mental health screening instruments in resource-constrained settings: Systematic review of the PHQ-9 and key recommendations

Mental illness is one of the largest contributors to the global disease burden. The importance of valid and reliable mental health measures is crucial in order to accurately measure said burden, to capture symptom improvement, and to ensure that symptoms are appropriately identified and quantified. This is of particular importance in low and middle-income countries (LMICs), where the burden of mental illness is relatively high, and there is heterogeneity in linguistic, racial, and ethnic groups. Using the PHQ-9 as an illustrative example, this systematic review aims to provide an overview of existing work and highlight common validation and reporting practices. A systematic review of published literature validating the use of the PHQ-9 in LMICs as indexed in the PubMed and PsychInfo databases was conducted. The review included n = 49 articles (reduced from n = 2,349). This manuscript summarizes these results in terms of the frequency of reporting on important procedures and in regards to the types of reliability and validity measured. Then, building off of the existing literature, we provide key recommendations for measure validation in LMICs, which can be generalized for any type of measure used in a setting in which it was not initially developed.

Psychometric Properties of a Spanish Version of the Fear of COVID-19 Scale in General Population of Lima, Peru

The current pandemic of the novel coronavirus COVID-19 has increased the anxiety and fear experienced by many. The main objective of this study was to analyze the psychometric properties of the Spanish-translated version of the Fear of COVID-19 Scale (FCV-19S) using a sample of population in Peru. This is a cross-sectional instrumental study. Data were collected by a convenience sampling method, resulting in a total of 832 participants, and the collection took place over 1 week, April 17–23, 2020. The original version of the FCV-19S was translated from English into Spanish. The results support a bifactor model consisting of one general factor and two specific factors—one of emotional fear reactions and another of somatic expressions of fear of COVID-19 (CFI = 0.988, RMSEA = 0.075). Invariance between healthcare workers and age groups was reached (ΔCFI < 0.01), but the invariance between men and women was not met (ΔCFI = 0.02). Convergent validity was found with depressive, anxious, and posttraumatic stress symptoms. The general factor of the fear of COVID-19 and two specific factors had an optimal level of internal consistency (ω > 0.89 and α > 0.83). The study found the Spanish-translated version of the FCV-19S has good psychometric properties and presents evidence of validity and reliability.

The Association of Race/Ethnicity, Dietary Intake, and Physical Activity with Depression

OBJECTIVE

This study investigated the association of race/ethnicity, dietary intake, and physical activity with depression and potential other barriers associated with the use of mental health services among depressed people.

METHODS

We used the nationally representative data, 2011-2016 National Health and Nutrition Examination Survey. Depression status was defined using a Patient Health Questionnaire. Multivariable logistic regressions were conducted on depression status and the use of mental health specialists among depressed adults, accounting for the complex sampling design.

RESULTS

The prevalence of depression was 8.3% with substantial racial/ethnic differences (8.0% for white, 3.1% for Asian, 9.2% for black, 7.6% for Mexican Hispanics, 13.0% for other Hispanics). Good/acceptable diet and a high level of physical activity were negatively associated with depression. Among depressed people, no significant racial/ethnic differences were observed in using mental health specialists.

CONCLUSION

Prevalence for depression was lower among people who have good or acceptable diet and moderate physical activity. These modifiable factors as well as race/ethnicity should be incorporated into psychotherapeutic interventions to improve depression.

Impact of Removing Nonprescription Codeine in Australia: Protocol for a Prospective Cohort Study

Background

On February 1, 2018, Australia rescheduled codeine to a prescription-only medication. Many concerns were associated with this change, including increased financial costs, reduced service accessibility, the potential for poorer pain management, and a decline in physical and mental health if codeine could not be accessed. In the research literature, there is limited knowledge about the long-term consequences of rescheduling pharmaceutical opioids and, as Australia has followed many countries in implementing a restriction on codeine, further study of these consequences is critical.

Objective

The goal of this study was to examine the impact of rescheduling codeine from an over-the-counter (OTC) product to a prescription-only medicine on the primary measures of codeine use and dependence in a prospective cohort of people who are frequent consumers of OTC codeine. Secondary measures included pain and self-efficacy, health service use, and mental health.

Methods

The Codeine Cohort study aimed to recruit 300 participants in Australia who regularly (at least a few times per week for the past 6 months) used OTC codeine. Using an online survey, participants were followed up at three time points (February 2018, June 2018, and February 2019) after codeine was rescheduled.

Results

All four waves of data collection are complete, with the final round of data collection finalized in August 2019. Data analyses are yet to be completed. Information on demographics, codeine use and dependence, physical and mental health, medication use, and health service use will be analyzed using mixed models.

Conclusions

Results of this study will provide insight into the effectiveness of regulatory restriction in curtailing nonmedical use of and harms associated with codeine. Additionally, results will explore positive and negative outcomes of codeine rescheduling for individual patients, which informs health professionals who support patients who use codeine and further community education.

International Registered Report Identifier (IRRID)

DERR1-10.2196/15540

Is depression comparable between asylum seekers and native Germans? An investigation of measurement invariance of the PHQ-9

BACKGROUND

Asylum seekers show high prevalence of depressive disorders compared to native populations. For the assessment of depression, the Patient Health Questionnaire-9 (PHQ-9) is a widely used instrument that has shown high validity and reliability. However, it is largely unknown whether PHQ-9 scores are comparable between asylum seekers living in Western countries and native populations, and whether results can be interpreted without reservation.

METHOD

Data from asylum seekers living in Germany (n = 243) and Germans without a migration background (n = 171) were used to analyze measurement invariance of the PHQ-9. Configural, scalar, and metric invariance was investigated, and test functioning was determined.

RESULTS

The PHQ-9 was not measurement invariant across Germans without a migration background and asylum seekers living in Germany. Differences were found regarding metric invariance and scalar invariance. The items anhedonia, depressed mood, appetite changes, psychomotor changes, and suicidal ideation had lower loadings and lower thresholds in asylum seekers compared to Germans without a migration background. That led to an overestimation translated into approximately one point on the sum-score.

LIMITATIONS

The study limitations include a heterogeneous sample of asylum seekers regarding countries of origin, and the utilization of the different language versions of the PHQ-9.

CONCLUSION

Our results may have implications for studies comparing levels of depression between asylum seekers and native Western samples. Even with the same latent level of depression, asylum seekers may have higher scores on several items and consequently a higher sum score. Therefore, the present results suggest a new determination or differentiation of the cut-off scores that were derived from Western samples.

Associations of negative cognitions, emotional regulation, and depression symptoms across four continents: International support for the cognitive model of depression

BACKGROUND

Cognitive-behavioral therapy (CBT) is one of the most widely tested and empirically supported psychological treatments for depression. Beck and other scholars established the theoretical foundations of CBT among North American populations, yet surprisingly few studies have examined central hypotheses of the cognitive model of depression among people living in non-Western regions.

METHODS

In the present study, we used the alignment method to minimize measurement bias to examine several central hypotheses of the cognitive model among adults living on four continents (n = 752): North America (n = 103; female = 29.1%), Europe (n = 404; female = 36.4%), South America (n = 108; female = 18.5%), and Asia (n = 136; female = 19.9%).

RESULTS

Depressive symptoms were positively and strongly correlated with negative automatic thoughts about self (ATQ-N), and moderately associated with dysfunctional attitudes (DAS) among people living on the four continents. Further, use of emotional suppression strategies to regulate emotion (ERQ-Suppression) was moderately and positively associated with depressive symptoms among people on all four continents, while use of cognitive-reappraisal (ERQ-Reappraisal) was not systematically associated with depressive symptoms.

CONCLUSIONS

Results of this study offer preliminary cross-continental support for foundational hypotheses of the cognitive model of depression. Negative thoughts appear to be associated with depression in all regions of the world, cementing this construct as a hallmark feature of the disorder.

Valid group comparisons can be made with the Patient Health Questionnaire (PHQ-9): A measurement invariance study across groups by demographic characteristics

Objective

Analyze the measurement invariance and the factor structure of the Patient Health Questionnaire-9 (PHQ-9) in the Peruvian population.

Method

Secondary data analysis performed using cross-sectional data from the Health Questionnaire of the Demographic and Health Survey in Peru. Variables of interest were the PHQ-9 and demographic characteristics (sex, age group, level of education, socioeconomic status, marital status, and area of residence). Factor structure was evaluated by standard confirmatory factor analysis (CFA), and measurement invariance by multi-group CFA, using standard goodness-of-fit indices criteria for interpreting results from both CFAs. Analysis of the internal consistency (α and ω) was also pursued.

Results

Data from 30,449 study participants were analyzed, 56.7% were women, average age was 40.5 years (standard deviation (SD) = 16.3), 65.9% lived in urban areas, 74.6% were married, and had 9 years of education on average (SD = 4.6). From standard CFA, a one-dimensional model presented the best fit (CFI = 0.936; RMSEA = 0.089; SRMR = 0.039). From multi-group CFA, all progressively restricted models had ΔCFI<0.01 across almost all groups by demographic characteristics. PHQ-9 reliability was optimal (α = ω = 0.87).

Conclusions

The evidence presents support for the one-dimensional model and measurement invariance of the PHQ-9 measure, allowing for reliable comparisons between sex, age groups, education level, socioeconomic status, marital status, and residence area, and recommends its use within the Peruvian population.

Depressive symptomatology in adolescents in Ghana: Examination of psychometric properties of the Patient Health Questionnaire-9

BACKGROUND

The Patient Health Questionnaire (PHQ-9) has been used extensively in research and clinical settings. However, there is limited information regarding the psychometric properties of the PHQ-9 among adolescents, particularly in sub-Saharan Africa.

METHODS

Data were collected from 553 adolescents (girls = 322, 58.1%) using a cross-sectional survey design to investigate the factorial validity, construct validity and internal consistency of the PHQ-9 in Ghana.

RESULTS

Confirmatory factor analysis (CFA) and multi-group CFA support a one-factor structure of the PHQ-9 that was invariant across gender. The PHQ-9 correlates significantly with measures of anxiety, depression, mental wellbeing, and suicidal behavior. The internal consistency of the PHQ-9 was 0.71.

LIMITATION

The study did not include a gold standard measure of depression to assess the diagnostic properties (e.g., sensitivity and specificity) of the PHQ-9.

CONCLUSION

The results suggest that major depressive disorder, measured by the PHQ-9, is a homogeneous construct across gender and that the PHQ-9 can be used to screen for depressive symptoms in adolescent boys and girls in Ghana.

Measurement invariance of the patient health questionnaire-9 (PHQ-9) depression screener in U.S. adults across sex, race/ethnicity, and education level: NHANES 2005-2016

BACKGROUND

Despite its popularity, little is known about the measurement invariance of the Patient Health Questionnaire-9 (PHQ-9) across U.S. sociodemographic groups. Use of a screener shown not to possess measurement invariance could result in under/over-detection of depression, potentially exacerbating sociodemographic disparities in depression. Therefore, we assessed the factor structure and measurement invariance of the PHQ-9 across major U.S. sociodemographic groups.

METHODS

U.S. population representative data came from the 2005-2016 National Health and Nutrition Examination Survey (NHANES) cohorts. We conducted a measurement invariance analysis of 31,366 respondents across sociodemographic factors of sex, race/ethnicity, and education level.

RESULTS

Considering results of single-group confirmatory factor analyses (CFAs), depression theory, and research utility, we justify a two-factor structure for the PHQ-9 consisting of a cognitive/affective factor and a somatic factor (RMSEA = 0.034, TLI = 0.985, CFI = 0.989). On the basis of multiple-group CFAs testing configural, scalar, and strict factorial invariance, we determined that invariance held for sex, race/ethnicity, and education level groups, as all models demonstrated close model fit (RMSEA = 0.025-0.025, TLI = 0.985-0.992, CFI = 0.986-0.991). Finally, for all steps ΔCFI was <-0.004, and ΔRMSEA was <0.01.

CONCLUSIONS

We demonstrate that the PHQ-9 is acceptable to use in major U.S. sociodemographic groups and allows for meaningful comparisons in total, cognitive/affective, and somatic depressive symptoms across these groups, extending its use to the community. This knowledge is timely as medicine moves towards alternative payment models emphasizing high-quality and cost-efficient care, which will likely incentivize behavioral and population health efforts. We also provide a consistent, evidence-based approach for calculating PHQ-9 subscale scores.

Generalised anxiety disorder in adolescents in Ghana: Examination of the psychometric properties of the Generalised Anxiety Disorder-7 scale

The Generalised Anxiety Disorder-7 (GAD-7) is a self-report scale used to assess general anxiety symptoms. Although the GAD-7 has been found to be a valid scale among adults, studies examining its psychometric properties among adolescents in high-income countries are notably limited and particularly non-existent in low- and middle-income countries. The current study addresses this lacuna by investigating the factorial validity, construct validity, internal consistency and discriminant accuracy of the GAD-7. Data were collected from 553 adolescents (boys = 231; average age = 16.85) recruited from a senior high school in Ghana, a sub-Saharan African country, using cross-sectional self-report methodology. The result supports a unidimensional structure of the GAD-7 that was invariant across gender. The GAD-7 correlates significantly with measures of anxiety, suicidal tendencies and mental well-being, suggesting construct validity. The internal consistency of the GAD-7, based on the mean inter-item correlation value of 0.24 and Cronbach’s a = 0.69, is adequate. The GAD-7 similarly discriminated between individuals at high risk of suicidal tendencies and depression from those with low or no risk, with area under curve values of 0.71 and 0.70, respectively. The GAD-7 is a reliable and valid measure to screen for generalised anxiety disorder among adolescents in Ghana.

The measurement invariance of the Patient Health Questionnaire-9 for American Indian adults

BACKGROUND

American Indian people have high suicide rates. However, little epidemiological data is available on depression prevalence, a suicide risk factor, in this population. Some research suggests that depression scales may perform differently for American Indian people. However, the Patient Health Questionnnaire-9 (PHQ-9), a depression scale widely-used in clinical practice, had not been assessed for cross-cultural measurement invariance with American Indian people.

METHODS

In this retrospective study of existing electronic health record (EHR) data in an upper Midwestern healthcare system, we assessed the measurement invariance of the standard one-factor PHQ-9 and five previously identified two-factor models for 4443 American Indian and 4443 Caucasian American adults (age >= 18) with a PHQ-9 in the EHR from 12/1/2005 to 12/31/2017. We also conducted subgroup analyses with adults ages >= 65.

RESULTS

Models showed good fits (e.g., CFI > 0.99, RMSEA < 0.05) and internal consistency reliability (ordinal alpha > 0.80). All models displayed measurement invariance between racial groups. Factor correlation was high for two-factor models, providing support for the one-factor model. American Indian adults had significantly higher odds of PHQ-9 total scores >= 10 and >= 15 than Caucasian American adults.

LIMITATIONS

Data came from a single healthcare system.

CONCLUSIONS

The PHQ-9 exhibited cross-cultural measurement invariance between American Indian and Caucasian American adults, supporting the PHQ-9 as a depression screening tool in this clinical care population. American Indian adults also had higher levels of depression than Caucasian Americans. Future research could confirm the generalizability of our findings to other American Indian populations.

Associations of mood symptoms with NYHA functional classes in angina pectoris patients: a cross-sectional study

BACKGROUND

Depression and anxiety are prevalent and associated with a worse prognosis in coronary heart disease (CHD) patients. However, the influence of disease severity on mood symptoms is unknown. The specific associations of mood symptoms with NYHA classes remain unexplored.

METHODS

In this cross-sectional study, 443 consecutive inpatients with angina pectoris (AP) confirmed by angiography were included into analysis. Somatic and cognitive symptom scores derived from Patient Health Questionnaire (PHQ-9) and Generalized Anxiety Disorder Scale (GAD-7) were used to assess mood symptoms. Predictors for depression and anxiety with strict and lax standards were compared. We hypothesized NYHA classification to be an indicator of disease severity through analyses with clinical features using ordinal logistic model. Applying both binary and ordinal logistic models, we evaluated the associations of mood symptoms with NYHA classes.

RESULTS

Discrepancy of disease severity existed between the depressed and nondepressed. NYHA classification was proved to be an integrated index under influence of age, coronary stenosis, heart failure and diabetes. NYHA class I and II individuals with AP were at equivalent risk for depression (NYHA II vs I: binary model OR 1.32 (0.59,2.96), p = 0.50; ordinal model OR 1.17 (0.73,1.88), p = 0.52), however NYHA class III/IV patients shared a sharply higher risk (NYHA III/IV vs I: binary model OR 3.32 (1.28,8.61), p = .013; ordinal model OR 3.94 (2.11,7.36), p < .001). Analyses on somatic and cognitive depressive symptoms confirmed this finding and hinted a greater impact of education background on mood when patient's condition is unstable. Anxiety seemed in the whole picture irrelevant with NYHA classes. Comparing with NYHA class I/II, AP patients in NYHA class III/IV tended to be less anxious. However, when CHD became unstable, the calmness may immediately be broken up. A great distinction of the ratio of anxiety and depression symptom scores between NYHA class III/IV stable and unstable AP patients (p = .018) was observed.

CONCLUSIONS

Mood symptoms in CHD patients are to a great extend derived from disease itself. Only for patients with relatively serious physical condition, unexpected discomforts caused by disease notably impact the emotions. Education background tends to influence the mood especially when disease is still unstable.

Shortening self-report mental health symptom measures through optimal test assembly methods: Development and validation of the Patient Health Questionnaire-Depression-4

BACKGROUND

The objective of this study was to develop and validate a short form of the Patient Health Questionnaire-9 (PHQ-9), a self-report questionnaire for assessing depressive symptomatology, using objective criteria.

METHODS

Responses on the PHQ-9 were obtained from 7,850 English-speaking participants enrolled in 20 primary diagnostic test accuracy studies. PHQ unidimensionality was verified using confirmatory factor analysis, and an item response theory model was fit. Optimal test assembly (OTA) methods identified a maximally precise short form for each possible length between one and eight items, including and excluding the ninth item. The final short form was selected based on prespecified validity, reliability, and diagnostic accuracy criteria.

RESULTS

A four-item short form of the PHQ (PHQ-Dep-4) was selected. The PHQ-Dep-4 had a Cronbach's alpha of 0.805. Sensitivity and specificity of the PHQ-Dep-4 were 0.788 and 0.837, respectively, and were statistically equivalent to the PHQ-9 (sensitivity = 0.761, specificity = 0.866). The correlation of total scores with the full PHQ-9 was high (r = 0.919).

CONCLUSION

The PHQ-Dep-4 is a valid short form with minimal loss of information of scores when compared to the full-length PHQ-9. Although OTA methods have been used to shorten patient-reported outcome measures based on objective, prespecified criteria, further studies are required to validate this general procedure for broader use in health research. Furthermore, due to unexamined heterogeneity, there is a need to replicate the results of this study in different patient populations.

Is assessment of depression equivalent for migrants of different cultural backgrounds? Results from the German population-based Gutenberg Health Study (GHS)

BACKGROUND

Bearing in mind the multicultural background of a national population, little is known about the measurement invariance across different cultures or ethnicities of frequently used screeners for depression. For this reason, the main objective of the current study is to assess the measurement invariance of the Patient Health Questionnaire (PHQ-9) across groups with different migration backgrounds.

METHODS

We provided psychometric analyses (descriptive statistics at item and scale level, reliability analysis, exploratory [EFA] and confirmatory factor analyses [CFA]) comparing a native population with first- and second-generation migrants of the German population-based Gutenberg Health Study with N = 13,973 participants completing the PHQ-9. Furthermore, we conducted measurement invariance analyses among different groups of first-generation migrants.

RESULTS

Comparing the native population with first- and second-generation migrants, a higher prevalence for mental distress was found for first generation. Although mean score patterns were similar for all groups, analyses of item loadings among first-generation migrants yielded some variance in patterns pointing out that certain items have a distinct impact on depression for specific groups. With regard to the factorial validity for all groups, EFA and CFA provided evidence for the proposed one latent factor structure of the PHQ-9. Depression assessed by the PHQ-9 turned out to be equivalent from a psychometric perspective across different groups stratified by their migration background.

CONCLUSIONS

Overall, results of thorough scale and item analyses, especially multigroup confirmatory analyses, provided support that depression, assessed by the PHQ-9, can be considered as psychometrically equivalent across all analyzed groups.

The latent structure of major depressive symptoms and its relationship with somatic disorder symptoms among Filipino female domestic workers in China

Emerging research have investigated the factor structure of major depressive disorder (MDD) symptoms based on DSM-5 nomenclature. However, to date, results have been inconsistent on what symptom-structure best represent MDD. This study examines the best fitting MDD among four competing models in a sample of overseas Filipino domestic helpers (N = 232). The results show that a two-factor model (Model 2b; Krause et al., 2010) provided the best fit. The model consist of two factors: somatic and non-somatic/affective symptoms. Somatic component includes sleep difficulties, fatigue, appetite changes, concentration difficulties, and psychomotor agitation/retardation while non-somatic/affective component covers anhedonia, depressed mood, feelings of worthlessness, and thoughts of death. Further, the results reveal a pattern where PHQ-15 somatic symptom-items have a higher significant relationship with MDD's somatic symptoms than with the MDD's non-somatic/affective symptoms. These findings suggest that the items of model 2b are appropriately embedded in their respective factors. Differentiating MDD factors have important clinical implications, particularly in the diagnosis and treatment of depression among overseas Filipino domestic helpers.

Cross-cultural validation of the German and Turkish versions of the PHQ-9: an IRT approach

BACKGROUND

The Patient Health Questionnaire's depression module (PHQ-9) is a widely used screening tool to assess depressive disorders. However, cross-linguistic and cross-cultural validation of the PHQ-9 is mostly lacking. This study investigates whether scores on the German and Turkish versions of the PHQ-9 are comparable.

METHODS

Data from Germans without a migration background (German version, n = 1670) and Turkish immigrants in Germany (either German or Turkish version, n = 307) were used. Differential Item Functioning (DIF) was assessed using Item Response Theory (IRT) models.

RESULTS

Several items of the PHQ-9 were found to exhibit DIF related to language or ethnicity, e.g. 'sleep problems', 'appetite changes' and 'anhedonia'. However, PHQ-9 sum scores were found to be unbiased, i.e., DIF had no notable impact on scale levels.

CONCLUSIONS

PHQ-9 sum scores can be compared between Turkish immigrants and Germans without a migration background without any adjustments, regardless of whether they complete the German or the Turkish version.

Assessment of depression before and after inpatient rehabilitation in COPD patients: Psychometric properties of the German version of the Patient Health Questionnaire (PHQ-9/PHQ-2)

BACKGROUND

Depression is a frequent comorbidity of COPD and leads to worse clinical COPD-outcomes. PHQ-9 and PHQ-2 are two widely used brief instruments to assess depression. However, psychometric properties in COPD patients are unknown. This study examines factorial validity, measurement invariance and composite reliability (CR) of PHQ-9/PHQ-2, respectively, and concordance between both tools.

METHODS

This is a secondary analysis of N = 561 COPD patients who filled out the PHQ-9 at the begin (T0), the end (T1) and 3/6/9/12 (T2/T3/T4/T5) months after pulmonary inpatient rehabilitation. Structural equation modeling was used to examine factorial validity and measurement invariance between gender, GOLD disease severity groups and over time. Concordance was assessed using Cohen's Kappa, Yules Y, positive and negative agreement.

RESULTS

A one-factor model (with one freed residual covariance) showed best model fit. At least partial scalar invariance could be established. Concordance between both instruments was substantial. 31.7% (26.2%) COPD patients showed clinically relevant depression according to PHQ-9 (PHQ-2) at T0. At T0-T2, PHQ-9 classified more patients as depressed than did PHQ-2. According to both measures, depression rates declined after rehabilitation. Reliability was high for both PHQ-9 (CR = 0.94) and PHQ-2 (CR = 0.89).

LIMITATIONS

No gold-standard (clinical interview) to assess depression was used. Therefore, diagnostic accuracy for PHQ-9/PHQ-2 remains unclear.

CONCLUSIONS

PHQ-9 and PHQ-2 fulfill important psychometric criteria (factorial validity, invariance, reliability) for measuring depression in COPD. The results support their use in clinical practice to assess severity of depression. Diagnostic accuracy to identify major/minor depression of both instruments should be examined in future studies.

Cohort profile: the Healthy Life in an Urban Setting (HELIUS) study in Amsterdam, The Netherlands

PURPOSE

Ethnic minority groups usually have a more unfavourable disease risk profile than the host population. In Europe, ethnic inequalities in health have been observed in relatively small studies, with limited possibilities to explore underlying causes. The aim of the Healthy Life in an Urban Setting (HELIUS) study is to investigate the causes of (the unequal burden of) diseases across ethnic groups, focusing on three disease categories: cardiovascular diseases, mental health and infectious diseases.

PARTICIPANTS

The HELIUS study is a prospective cohort study among six large ethnic groups living in Amsterdam, the Netherlands. Between 2011 and 2015, a total 24 789 participants (aged 18-70 years) were included at baseline. Similar-sized samples of individuals of Dutch, African Surinamese, South-Asian Surinamese, Ghanaian, Turkish and Moroccan origin were included. Participants filled in an extensive questionnaire and underwent a physical examination that included the collection of biological samples (biobank).

FINDINGS TO DATE

Data on physical, behavioural, psychosocial and biological risk factors, and also ethnicity-specific characteristics (eg, culture, migration history, ethnic identity, socioeconomic factors and discrimination) were collected, as were measures of health outcomes (cardiovascular, mental health and infections). The first results have confirmed large inequalities in health between ethnic groups, such as diabetes and depressive symptoms, and also early markers of disease such as arterial wave reflection and chronic kidney disease, which can only just partially be explained by inequalities in traditional risk factors, such as obesity and socioeconomic status. In addition, the first results provided important clues for targeting prevention and healthcare.

FUTURE PLANS

HELIUS will be used for further research on the underlying causes of ethnic differences in health. Follow-up data will be obtained by repeated measurements and by linkages with existing registries (eg, hospital data, pharmacy data and insurance data).

Measurement invariance testing of the PHQ-9 in a multi-ethnic population in Europe: the HELIUS study

BACKGROUND

In Western European countries, the prevalence of depressive symptoms is higher among ethnic minority groups, compared to the host population. We explored whether these inequalities reflect variance in the way depressive symptoms are measured, by investigating whether items of the PHQ-9 measure the same underlying construct in six ethnic groups in the Netherlands.

METHODS

A total of 23,182 men and women aged 18-70 of Dutch, South-Asian Surinamese, African Surinamese, Ghanaian, Turkish or Moroccan origin were included in the HELIUS study and had answered to at least one of the PHQ-9 items. We conducted multiple group confirmatory factor analyses (MGCFA), with increasingly stringent model constraints (i.e. assessing Configural, Metric, Strong and Strict measurement invariance (MI)), and regression analysis, to confirm comparability of PHQ-9 items across ethnic groups.

RESULTS

A one-factor model, where all nine items reflect a single underlying construct, showed acceptable model fit and was used for MI testing. In each subsequent step, change in goodness-of-fit measures did not exceed 0.015 (RMSEA) or 0.01 (CFI). Moreover, strict invariance models showed good or acceptable model fit (Men: RMSEA = 0.050; CFI = 0.985; Women: RMSEA = 0.058; CFI = 0.979), indicating between-group equality of item clusters, factor loadings, item thresholds and residual variances. Finally, regression analysis did not indicate potential ethnicity-related differential item functioning (DIF) of the PHQ-9.

CONCLUSIONS

This study provides evidence of measurement invariance of the PHQ-9 regarding ethnicity, implying that the observed inequalities in depressive symptoms cannot be attributed to DIF.

Factor structure and longitudinal measurement invariance of PHQ-9 for specialist mental health care patients with persistent major depressive disorder: Exploratory Structural Equation Modelling

BACKGROUND

The Patient Health Questionnaire-9 (PHQ-9) is a widely used instrument for measuring levels of depression in patients in clinical practice and academic research; its factor structure has been investigated in various samples, with limited evidence of measurement equivalence/invariance (ME/I) but not in patients with more severe depression of long duration. This study aims to explore the factor structure of the PHQ-9 and the ME/I between treatment groups over time for these patients.

METHODS

187 secondary care patients with persistent major depressive disorder (PMDD) were recruited to a randomised controlled trial (RCT) with allocation to either a specialist depression team arm or a general mental health arm; their PHQ-9 score was measured at baseline, 3, 6, 9 and 12 months. Exploratory Structural Equational Modelling (ESEM) was performed to examine the factor structure for this specific patient group. ME/I between treatment arm at and across follow-up time were further explored by means of multiple-group ESEM approach using the best-fitted factor structure.

RESULTS

A two-factor structure was evidenced (somatic and affective factor). This two-factor structure had strong factorial invariance between the treatment groups at and across follow up times.

LIMITATIONS

Participants were largely white British in a RCT with 40% attrition potentially limiting the study's generalisability. Not all two-factor modelling criteria were met at every time-point.

CONCLUSION

PHQ-9 has a two-factor structure for PMDD patients, with strong measurement invariance between treatment groups at and across follow-up time, demonstrating its validity for RCTs and prospective longitudinal studies in chronic moderate to severe depression.

A combined high-sugar and high-saturated-fat dietary pattern is associated with more depressive symptoms in a multi-ethnic population: the HELIUS (Healthy Life in an Urban Setting) study

OBJECTIVE

To identify a high-sugar (HS) dietary pattern, a high-saturated-fat (HF) dietary pattern and a combined high-sugar and high-saturated-fat (HSHF) dietary pattern and to explore if these dietary patterns are associated with depressive symptoms.

DESIGN

We used data from the HELIUS (Healthy Life in an Urban Setting) study and included 4969 individuals aged 18-70 years. Diet was assessed using four ethnic-specific FFQ. Dietary patterns were derived using reduced rank regression with mono- and disaccharides, saturated fat and total fat as response variables. The nine-item Patient Health Questionnaire (PHQ-9) was used to assess depressive symptoms by using continuous scores and depressed mood (identified using the cut-off point: PHQ-9 sum score ≥10).

SETTING

The Netherlands.

RESULTS

Three dietary patterns were identified; an HSHF dietary pattern (including chocolates, red meat, added sugars, high-fat dairy products, fried foods, creamy sauces), an HS dietary pattern (including sugar-sweetened beverages, added sugars, fruit (juices)) and an HF dietary pattern (including high-fat dairy products, butter). When comparing extreme quartiles, consumption of an HSHF dietary pattern was associated with more depressive symptoms (Q1 v. Q4: β=0·18, 95 % CI 0·07, 0·30, P=0·001) and with higher odds of depressed mood (Q1 v. Q4: OR=2·36, 95 % CI 1·19, 4·66, P=0·014). No associations were found between consumption of the remaining dietary patterns and depressive symptoms.

CONCLUSIONS

Higher consumption of an HSHF dietary pattern is associated with more depressive symptoms and with depressed mood. Our findings reinforce the idea that the focus should be on dietary patterns that are high in both sugar and saturated fat.

Social Adversity and Psychosis: The Mediating Role of Cognitive Vulnerability

BACKGROUND

Social adversity is a risk factor for psychosis, but the translating mechanisms are not well understood. This study tests whether the relationship between social adversity and psychosis is mediated by cognitive vulnerability in the form of low perceived social rank, negative schemas related to self and other, and loneliness and whether the putative mediations are specific to psychosis or are largely explained by depression.

METHODS

The study was a survey in a community sample (N = 2350) from Germany (n = 786), Indonesia (n = 844), and the United States (n = 720). Mediation path analysis with structural equation modeling was used to test for the specificity of the hypothesized paths to psychosis controlling for depression.

RESULTS

Social adversity had a significant medium to large effect on positive (R2 = .20) and negative symptoms (R2 = .38). Social rank, negative schemas, and loneliness significantly mediated the relationship between social adversity and negative symptoms and the models explained a large amount of the variance (R2 = .43-.44). For positive symptoms, only negative schemas were a significant mediator (R2 = .27).

DISCUSSION

The results emphasize the role of social adversity in psychosis and support the assumption that cognitive vulnerability is a relevant translating mechanism as postulated by the social defeat hypothesis and cognitive models of psychosis. This underlines the relevance of the clinical practice of targeting beliefs in cognitive interventions for psychosis. It also indicates that targeting cognitive vulnerability in people experiencing social adversity could be a promising approach to prevention.

[Reliability and dimensionality of PHQ-9 in screening depression symptoms among health science students in Cartagena, 2014]

INTRODUCTION

Depression among university students must be screened with valid instruments. The Patient Health Questionnaire (PHQ-9) is reliable and valid for screening depression in a university context; however, its psychometric performance in Colombia is unknown.

OBJECTIVE

To estimate the reliability and dimensionality of PHQ-9 as a screening instrument for depressive symptoms among health sciences students of a university in Cartagena, Colombia.Materials y methods: We analyzed the factorial structure and reliability of the PHQ-9 in a sample of 550 students for expected prevalence of clinically-meaningful depressive symptoms (CMDS) of 25% with a confidence level of 95% and an error level of 3%. We used the free Spanish version of PHQ-9 for Colombia, authorized by its creators. A confirmatory factorial analysis, and an estimate of internal consistency using Cronbach´s alfa and McDonald´s omega were obtained.

RESULTS

We analyzed 541 surveys. The average age of the group was 20.18 (SD=2.59) years old, 354 (63.77%) participants were women and 196 (36.23%) men. CMDS prevalence was 27.3%. The confirmatory factorial analysis exhibited a two-factor model, which explained the total variance of 42.80%. The proportion of variance explained by the factors was 0.243 (item 5) and 0.587 (item 2). Cronbach´s alfa was 0.830 and McDonald´s omega, 0.89.

CONCLUSIONS

PHQ-9 was a valid and reliable tool for screening depressive symptoms among health sciences students in a university in Cartagena, Colombia.

The Whiteley Index-6: An Examination of Measurement Invariance Among Self-Identifying Black, Latino, and White Respondents in Primary Care

Brief measures that are comparable across disparate groups are particularly likely to be useful in primary care settings. Prior research has supported a six-item short form of the Whiteley Index (WI), a commonly used measure of health anxiety, among English-speaking respondents. This study examined the measurement invariance of the WI-6 among Black ( n = 183), Latino ( n = 173), and White ( n = 177) respondents seeking treatment at a U.S. community health center. Results supported a bifactor model of the WI-6 among the composite sample ( N = 533), suggesting the presence of a general factor and two domain-specific factors. Results supported the incremental validity of one of the domain-specific factors in accounting for unique variance in somatic symptom severity scores beyond the general factor. Multiple-groups confirmatory factor analysis supported the configural, metric, ands scalar invariance of the bifactor WI-6 model across the three groups of respondents. Results provide support for the measurement invariance of the WI-6 among Black, Latino, and White respondents. The potential use of the WI-6 in primary care, and broader, settings is discussed.

Mental Health and Health-Related Quality of Life in Multiple Sclerosis Caregivers in Mexico

BACKGROUND

Multiple sclerosis (MS) rates are increasing in Latin America, and caregiving for an individual with MS is associated with poorer mental and physical health outcomes. No existing research has examined the relation between mental health and health-related quality of life (HRQOL) in MS caregivers in Latin America.

METHODS

The present study examined the association between mental health (Patient Health Questionnaire-9, Satisfaction with Life Scale, Rosenberg Self-esteem Scale, State-Trait Anxiety Inventory) and HRQOL (36-item Short Form Health Status Survey) in 81 Mexican MS caregivers.

RESULTS

A canonical correlation analysis uncovered a large, significant overall association between mental health and HRQOL, with 52.7% of the variance shared between the two sets of constructs. When individual canonical loadings were examined in this analysis, the most substantial pattern that emerged was between depression and general health. Four regressions controlling for demographic variables found that HRQOL uniquely accounted for 19.0% of the variance in caregiver anxiety, 32.5% in depression, 13.5% in satisfaction with life, and 14.3% in self-esteem.

CONCLUSIONS

These findings demonstrated a strong association between HRQOL and mental health, which points to directions for future studies on interventions for MS caregivers, particularly in Mexican and other Latino populations.

Perceived ethnic discrimination and depressive symptoms: the buffering effects of ethnic identity, religion and ethnic social network

PURPOSE

Perceived ethnic discrimination (PED) is positively associated with depressive symptoms in ethnic minority groups in Western countries. Psychosocial factors may buffer against the health impact of PED, but evidence is lacking from Europe. We assessed whether ethnic identity, religion, and ethnic social network act as buffers in different ethnic minority groups in Amsterdam, the Netherlands.

METHODS

Baseline data were used from the HEalthy Living In a Urban Setting study collected from January 2011 to June 2014. The random sample included 2501 South-Asian Surinamese, 2292 African Surinamese, 1877 Ghanaians, 2626 Turks, and 2484 Moroccans aged 18-70 years. Depressive symptoms were assessed using the Patient Health Questionnaire-9. PED was measured with the Everyday Discrimination Scale. Ethnic identity was assessed using the Psychological Acculturation Scale. Practicing religion was determined. Ethnic social network was assessed with the number of same-ethnic friends and amount of leisure time spent with same-ethnic people.

RESULTS

PED was positively associated with depressive symptoms in all groups. The association was weaker among (a) those with strong ethnic identity in African Surinamese and Ghanaians, (b) those practicing religion among African Surinamese and Moroccans, (c) those with many same-ethnic friends in South-Asian Surinamese, Ghanaians, and Turks, and (d) those who spend leisure time with same-ethnic people among African Surinamese and Turks.

CONCLUSIONS

Ethnic identity, religion, and ethnic social network weakened the association between PED and depressive symptoms, but the effects differed by ethnic minority group. These findings suggest that ethnic minority groups employ different resources to cope with PED.