Is adjustment disorder unidimensional or multidimensional? Implications for ICD-11

Validation of the Spanish version of the Adjustment Disorder New Module-20 (ADNM-20) in a non-clinical sample

BACKGROUND

There is a lack of self-report measures specifically designed for Adjustment disorder. One of the most widely used instruments is the Adjustment Disorder New Module (ADNM), which has already been validated in different countries. The aim of this study was to validate the Spanish version of the ADNM-20 with a non-clinical sample, including a comparison with a high-risk sample.

METHOD

203 participants of the general population (mean age = 33.84) completed an online survey which included the Spanish version of the ADNM, the anxiety and depression measures GAD-7 and PHQ-9, and an assesment of coping strategies using the Brief-COPE.

RESULTS

The analysis of the scale's internal structure revealed that a hierarchical model could best fit the data, as well as a bifactorial structure. The scale showed high internal consistency and an adequate differential validity, as differences were observed when comparing the high-risk and non-clinical groups. Positive correlations were also identified between ADNM and depression and anxiety, as well as different correlations with coping strategies.

CONCLUSION

This study presents the first validation of the ADNM-20 in Spanish showing good reliability and validity results. In addition, a comparison with a high-risk sample and norms are offered to help future evaluators.

ICD-11 adjustment disorder: Translation and validation of the Danish international adjustment disorder questionnaire among a working population of social educators

Adjustment disorder is frequently used as a diagnostic category for work-related stress disorders in Denmark. However, the diagnostic category is poorly delineated in ICD-10 which has hampered clinical practice as well as research studying the development of work-related adjustment disorders. In ICD-11, the diagnostic category of adjustment disorder has been refined and a new self-report measure is available to operationalize symptoms. The aim of the current study is to translate the International Adjustment Disorder Questionnaire (IADQ) to Danish and test the psychometric properties of the scale in a sample of social educators. A total of 609 social educators in current employment participated in an online survey including the IADQ and data was analyzed using confirmatory factor analysis. Findings suggested that a two-factor model reflecting the distinction between preoccupation and failure to adapt as part of the diagnostic criterion fitted the data best, although strong factor correlations and one cross-factor loading suggests that differentiating between the dimensions of preoccupation and failure to adapt is difficult. Relationships to burnout, posttraumatic stress and general distress support the validity of the Danish translation of the IADQ. Further research should explore the structure of adjustment disorder among other working populations.

Exhaustion disorder: scoping review of research on a recently introduced stress-related diagnosis

BACKGROUND

Symptoms related to chronic stress are prevalent and entail high societal costs, yet there is a lack of international consensus regarding diagnostics and treatment. A new stress-related diagnosis, exhaustion disorder, was introduced into the Swedish version of ICD-10 in 2005. Since then, use of the diagnosis has increased rapidly.

AIMS

To create the first comprehensive synthesis of research on exhaustion disorder to report on the current state of knowledge. Preregistration: Open Science Framework (http://www.w3.org/1999/xlink">osf.io), doi 10.17605/OSF.IO/VFDKW.

METHOD

A PRISMA-guided scoping review of all empirical studies of exhaustion disorder was conducted. Searches were run in the MEDLINE, PsycInfo and Web of Science databases. Data were systematically charted and thematically categorised based on primary area of investigation.

RESULTS

Eighty-nine included studies were sorted into six themes relating to lived experience of exhaustion disorder (n = 9), symptom presentation and course (n = 13), cognitive functioning (n = 10), biological measures (n = 24), symptom measurement scales (n = 4) and treatment (n = 29). Several studies indicated that individuals with exhaustion disorder experience a range of psychiatric and somatic symptoms beyond fatigue, but robust findings within most thematic categories were scarce. The limited number of studies, lack of replication of findings and methodological limitations (e.g. small samples and scarcity of specified primary outcomes) preclude firm conclusions about the diagnostic construct.

CONCLUSIONS

More research is needed to build a solid knowledge base for exhaustion disorder. International collaboration regarding the conceptualisation of chronic stress and fatigue is warranted to accelerate the growth of evidence.

The network structure of ICD-11 adjustment disorder: A comparison of clinical and nonclinical samples

Background

International Classification of Diseases, 11th revision (ICD-11) adjustment disorder (AjD) is characterized by two main symptom clusters: preoccupation with the stressor and failure to adapt to the stressor. The network analytic approach provides important information on the structural validity of a disorder and reveals which symptoms are most prominent. To date, no study compared the network structure of AjD symptoms in clinical and nonclinical samples, which could potentially inform our understanding of psychopathological mechanisms that underlie AjD and identify core targets for therapy.

Methods

A network analysis was conducted on AjD symptoms as assessed by the Adjustment Disorder—New Module (ADNM-8) using data from 330 clinical participants from the UK and a nonclinical sample of 699 participants from Switzerland.

Results

Comparisons of network structure invariance revealed differences between the network structure of the clinical and the nonclinical samples. Results highlight that in terms of both edges strength and centrality, failure to adapt symptoms was more prominent in the clinical sample, while the preoccupation symptoms were more prominent in the nonclinical sample. Importantly, global strength was similar across networks.

Conclusions

Results provide evidence of the coherence of AjD in the ICD-11 as assessed by the ADNM questionnaire. They tentatively suggest that subclinical AjD may be characterized by emerging preoccupation symptoms that may result in failure to adapt and functional impairment in clinical manifestation of AjD. However, there is a need for replication and longitudinal research to further validate this hypothesis.

Validation of the French ADNM-20 in the assessment of emotional difficulties resulting from COVID-19 quarantine and outbreak

Background

Multiple psychological consequences of the COVID-19 outbreak and quarantine have been described. However, there is a lack of global conceptualization. We argue that the stressful aspects of the situation, the multiple environmental consequences of the outbreak, and the diversity of symptoms observed in such a situation, suggest that Adjustment disorder (AD) is a promising way to conceptualize the psychological consequences of the outbreak and quarantine. The first aim of the study was to validate the French version of the ADNM. The second aim was to set out adjustment difficulties resulting from COVID-19 outbreak and quarantine.

Method

We recruited 1010 (840 women, 170 men) who consented online to participate. They filled out the French ADNM, visual analogic scales, HADS, IES, and the COPE, to evaluate coping strategies.

Results

We confirmed the factor structure of the ADNM and we found good psychometric properties. We found that 61.3% of participants presented an adjustment disorder related to COVID-19 outbreak. We found multiple risk factors and protective factors to AD due to quarantine and outbreak. We also identified the coping strategies negatively and positively associated with AD.

Conclusion

Adjustment disorder is a relevant concept to understand psychological manifestations caused by quarantine and outbreak. The French ANDM has good psychometric properties to evaluate such manifestations. The association between coping strategies and AD symptoms suggest that CBT may be the best intervention to help people suffering from AD.

Supplementary Information

The online version contains supplementary material available at 10.1186/s40359-021-00683-7.

Psychometric evaluation of the Adjustment Disorder New Module-20 (ADNM-20): A multi-study analysis

The Adjustment Disorder New Module (ADNM) is a self-report instrument for assessing Adjustment disorder (AjD), but uncertainties remain in evaluating factor structure and psychometric properties of ADNM in previous studies. Three studies were conducted to examine the factor structure, psychometrics properties, and clinical utility of the 20-item version of ADNM (ADNM-20) and 4-item version (ADNM-4) among samples of Hong Kong Chinese (N = 1,415). Confirmatory factor analysis demonstrated good model fitness with a bifactor model. Statistical indices indicated unidimensionality of AjD. The model-based reliability showed that the total score of ADNM-20 should be used in scoring and interpretation for capturing the construct of AjD. ADNM-4 model demonstrated full invariance between women and men and partial invariance between age groups. Receiver operating characteristic analysis revealed a cutoff score of 10 for probable AjD. The prevalence of probable AjD was 20.5 % excluding cases with probable depression among a population-representative sample of Hong Kong Chinese amid civil unrest in Hong Kong in July 2019. Cutoff scores of ADNM-20 (49) and ADNM-4 (9) were established for clinically significant common psychiatric conditions, namely PTSD, depression, and anxiety. Both ADNM-20 and ADNM-4 were reliable and valid to assess probable AjD. Implications for clinical research and practice are discussed.

Reliability and Validity of a German Standardized Diagnostic Interview Module for ICD-11 Adjustment Disorder

The ICD-11 includes a new definition of adjustment disorder (AjD). The present study aimed to examine interrater reliability, internal consistency, and construct validity of a new diagnostic interview module to assess ICD-11 AjD. Data from two studies that used a standardized diagnostic interview assessment (i.e., DIA-X/M-CIDI and updated DIA-X-5) were used. For interrater reliability, agreement indicators (i.e., κ) were calculated using data from the DIA-X-5 test-retest study (N = 60). To examine internal consistency and construct validity, Cronbach's alpha values and the Kuder-Richardson correlation coefficient were computed along with confirmatory factor and latent class analyses (LCA), using data from the Zurich Adjustment Disorder Study (N = 330). Interrater reliability analyses found an adjusted kappa of 0.807 for the ICD-11 AjD diagnosis. Few items from the impairment criterion of the diagnostic algorithm performed poorly. The internal consistency was acceptable, Cronbach's αs = .43-.80; the lower-bound estimate resulted from the two-item preoccupation symptom pattern. However, both items were significantly associated, OR = 3.14, 95% CI [1.97, 4.99]. Regarding LCA results, a two-class model was favored. We found that 94.3% of all ICD-11 AjD cases belonged to Class 2, OR = 23.69, 95% CI [7.15, 79.54], which was associated with subjectively rated distress, OR = 2.18, 95% CI [1.57, 3.02], and the external measure of the Brief Symptom Inventory global severity index, OR = 2.18, 95% CI [1.57, 3.02]. Overall, the new AjD interview module provided a reliable, valid assessment of the ICD-11 diagnosis; confirmation by other studies is needed.

Psychometric properties of the Chinese version of adjustment disorder new module-20 in breast cancer patients

Background

After the new definition of adjustment disorder (AjD) by the International Classification of Diseases-11(ICD-11), AjD has attracted more and more attention. Adjustment disorder new module-20 (ADNM-20), which is used to diagnose AjD, has been verified in some countries, but it has not been verified in China. As a result, the purpose of this study was to investigate the validity and reliability of the Chinese version of the Adjustment disorder new module-20 (ADNM-20) in female breast cancer patients.

Methods

The ADNM-20 translated into Chinese employed the translation and back translation technique. Three hundred fifty four newly diagnosed (< 1 year) female breast cancer patients were recruited from Tongji Hospital and Hubei Cancer Hospital in Hubei, China. The patients completed the self-report questionnaire including demographic characteristics and the scale ADNM-20. Data on psychometric properties were evaluated in terms of internal consistency, item-total correlations, test-retest reliability, and factorial validity.

Results

ADNM-20 core symptoms included 8 items and two factors, which were extracted by using exploratory factor analysis (EFA). It could explain 61.74% of the total variance. ADNM-20 accessory symptoms including 12 items and four factors, which were extracted by using EFA. It could explain 68.34% of the total variance. Cronbach’s α coefficient for ADNM-20 was 0.93, split-half reliability was 0.87, and the test-retest correlation coefficient was 0.74. The correlation coefficient between each subscale was ranged from 0.53 to 0.71 (P < 0.01), while the correlation coefficient between the subscales and total scale was ranged from 0.79 to 0.89 (P < 0.01).

Conclusions

The study verified the validity and reliability of the Chinese version of ADNM-20. It is applicable to measure the prevalence of adjustment disorder in the breast cancer population.

The 12-Month Course of ICD-11 Adjustment Disorder in the Context of Involuntary Job Loss

Background

After its redefinition in ICD-11, adjustment disorder (AjD) comprises two core symptom clusters of preoccupations and failure to adapt to the stressor. Only a few studies investigate the course of AjD over time and the definition of six months until the remission of the disorder is based on little to no empirical evidence. The aim of the present study was to investigate the course of AjD symptoms and symptom clusters over time and to longitudinally evaluate predictors of AjD symptom severity.

Method

A selective sample of the Zurich Adjustment Disorder Study, N = 105 individuals who experienced involuntary job loss and reported either high or low symptom severity at first assessment (t1), were assessed M = 3.4 (SD = 2.1) months after the last day at work, and followed up six (t2) and twelve months (t3) later. They completed a fully structured diagnostic interview for AjD and self-report questionnaires.

Results

The prevalence of AjD was 21.9% at t1, 6.7% at t2, and dropped to 2.9% at t3. All individual symptoms and symptom clusters showed declines in prevalence rates across the three assessments. A hierarchical regression analysis of symptoms at t3 revealed that more symptoms at the first assessment (β = 0.32, p = .002) and the number of new life events between the first assessment and t3 (β = 0.29, p = .004) significantly predicted the number of AjD symptoms at t3.

Conclusion

Although prevalence rates of AjD declined over time, a significant proportion of individuals still experienced AjD symptoms after six months. Future research should focus on the specific mechanisms underlying the course of AjD.

Measuring ICD-11 adjustment disorder: the development and initial validation of the International Adjustment Disorder Questionnaire

BACKGROUND

Adjustment disorder (AjD) is one of the most frequently used diagnoses in psychiatry but a diagnostic definition for AjD was only introduced in release of the ICD-11. This study sought to develop and validate a new measure operationalizing the ICD-11's narrative description of AjD, and to determine the current rate of people meeting the symptoms indicative of AjD in the general population of the Republic of Ireland.

METHODS

The International Adjustment Disorder Questionnaire (IADQ) was constructed to measure the core diagnostic criteria of ICD-11 AjD: stressor exposure, preoccupations with, and failure to adapt to, the stressor, timing of symptom onset, and functional impairment. A nationally representative sample (N = 1,020) of adults from Ireland completed the IADQ.

RESULTS

Confirmatory factor analysis supported construct validity and the reliability estimates were excellent. The IADQ correlated strongly with depression, anxiety, and posttraumatic stress. The criteria were met by 7.0% of the sample, adjusted for other exclusionary disorders.

DISCUSSION

The IADQ is a measure based on the ICD-11's description and produces reliable scores, however it should not be used for clinical assessment until validated with clinical interviews.

Risk factors of ICD-11 adjustment disorder in the Lithuanian general population exposed to life stressors

Background: A new definition of adjustment disorder symptoms has been included in the 11th edition of the International Classification of Diseases (ICD-11). However, little is known about risk factors of ICD-11 adjustment disorder. Objective: The study aimed to analyse risk factors of adjustment disorder in a sample of the Lithuanian general population exposed to life-stressors. Method: In total, the study included 649 adult participants from the general population with various recent significant life-stressor experiences. ICD-11 adjustment disorder symptoms were measured using the Adjustment Disorder New Module-8 (ADNM-8) scale. Results: The prevalence of the ICD-11 adjustment disorder diagnosis in the sample was 16.5%. Job-related stressors and health-related stressors were significantly associated with adjustment disorder. Other risk factors for adjustment disorder in this study were female gender, greater age, and university education. Conclusions: We conclude that stressor type and demographic characteristics are associated with the risk of developing an adjustment disorder.

Couples Adjusting to Multimorbidity: A Dyadic Study on Disclosure and Adjustment Disorder Symptoms

Background

Multimorbidity is challenging not only for the patient but also for the romantic partner. Strategies for interpersonal emotion regulation like disclosing to the partner are supposed to play a major role in the psychosocial adjustment to multimorbidity. Research has often focused on disease-related disclosure, even though disclosing thoughts and feelings related to mundane, everyday life occurrences might also play a role in coadjustment. The current dyadic study aimed at investigating the association between these two types of interpersonal regulation strategies and adjustment disorder symptoms, following the new ICD 11 criteria in multimorbid patients and their partners.

Methods

Shortly after being hospitalized due to an acute health crisis, N = 28 multimorbid patients (average age 70 years) and their partners filled in questionnaires on disclosure in the couple, adjustment disorder criteria of the ICD 11 (“preoccupation,” “failure to adapt”), and sleep problems.

Results

Both patients and their partners did show similarly high levels of preoccupation and failure to adapt indicating adjustment problems to the complex health situation. The adjustment symptoms of both partners correlated between r = 0.22 and 0.45. Regression based on Actor-Partner Interdependence-Models revealed that own mundane disclosure was related to less adjustment symptoms in the patients. Beyond that, a partner effect was observed, revealing a negative association between partners’ illness-related disclosure and the patients’ level of preoccupation. For the partners, mundane disclosure of the partner was associated with less preoccupation, failure to adapt, and reported sleep problems above and beyond own disclosure reports. Furthermore, there was an actor effect of disease-related disclosure on less sleep problems for the partners.

Conclusion

These results support an interpersonal view on adjustment processes to physical disease. Disclosure as a way of regulating the relationship and emotional responses might play a relevant role here, which seems to be different for patients and their partners. Further research is needed to shed more light on the differential role of disease-related and mundane everyday disclosure for psychosocial adjustment in couples confronted with health challenges.

Adjustment Disorder: Current Developments and Future Directions

Despite its high prevalence in clinical and consultant liaison psychiatry populations, adjustment disorder research has traditionally been hindered by its lack of clear diagnostic criteria. However, with the greater diagnostic clarity provided in the Diagnostic and Statistical Manual of Mental Disorders – fifth edition (DSM-5) and the International Statistical Classification of Diseases and Related Health Problems, 11th edition (ICD-11), adjustment disorder has been increasingly recognised as an area of research interest. This paper evaluates the commonalities and differences between the ICD-11 and DSM-5 concepts of adjustment disorder and reviews the current state of knowledge regarding its symptom profile, course, assessment, and treatment. In doing so, it identifies the gaps in our understanding of adjustment disorder and discusses future directions for research.

Is adjustment disorder unidimensional or multidimensional? Implications for ICD-11

In preparation for ICD-11, the adjustment disorder (AjD) diagnosis has undergone considerable revisions; however, the latent structure of AjD remains uncertain. It is unclear whether AjD is best represented as a unidimensional or multidimensional construct. This study performed a comprehensive assessment of the latent structure of AjD symptomatology and assessed its concurrent and discriminant validity. Individuals who experienced involuntary job loss (N = 333) completed a self-report measure of AjD symptoms. Seven alternative models of AjD were tested using confirmatory factor analysis. General psychological distress, impairment in social functioning, occupational self-efficacy, and sense of coherence were used as criterion variables for construct validity. In the confirmatory factor analysis, a bifactor solution with one dominant general AjD factor and 5 correlated group factors (preoccupation, failure-to-adapt, avoidance, affective reaction, and impulsivity) provided optimal fit. As expected, the AjD factor showed strong positive associations with general psychological distress and impairments in social functioning and moderately negative associations with occupational self-efficacy and sense of coherence. With regard to unidimensionality or multidimensionality of AjD symptoms, the current results indicate the plausibility of a unidimensional conceptualization. Future research should focus on essential key characteristics and a reduction of symptoms for the AjD definition.

A scoping review of ICD-11 adjustment disorder research

Background: Adjustment disorder (AjD) is one of the most used mental disorder diagnoses among mental health professionals. Important revisions of the AjD definition in the 11th edition of the International Classification of Diseases (ICD-11) are proposed. AjD is included in a chapter of disorders specifically associated with stress in ICD-11. Objective: This paper aims to review recent developments in ICD-11 AjD research, and to discuss the available ICD-11 AjD diagnosis validation studies, AjD measures, treatment studies, and outline the future perspectives for AjD research and clinical practice. Methods: In total, 10 empirical studies of AjD ICD-11 were identified and included in this review. We searched for studies in Embase, PubMed, PsycINFO, Scopus, PILOTS, SocINDEX, and via additional search by contacting authors of published empirical studies and reference screening. Results: Review of the studies revealed a lack of validation studies of the ICD-11 AjD symptom structure. AjD validation study findings are ambiguous, and there is still little support for the proposed two symptom structure of AjD for the ICD-11. A self-report AjD measure 'Adjustment Disorder New Module' (ADNM) based on the ICD-11 definition has been developed and used in all 10 reviewed studies. Two self-help interventions have been developed for the ICD-11 AjD, and findings from these studies indicate that self-help low-intensity cognitive-behavioural interventions, delivered via bibliography or internet-based, might be effective treatment of AjD. Conclusions: The AjD definition in ICD-11 with a description of a new symptom profile facilitates AjD measurement and AjD-focused treatment developments. More studies and insights from clinical practice are needed to move the field of AjD research and practice forward.