Using the PLUM procedure of SPSS to fit unequal variance and generalized signal detection models

Cortisol Synchrony in Psychotherapy for Major Depressive Disorder

INTRODUCTION

Accumulating research emphasizes the role of interpersonal coordination in arousal levels, which may manifest as cortisol synchrony, in interpersonal interactions. While the role of cortisol has been investigated in psychotherapy, cortisol synchrony and its characteristics and effect on treatment progress remain a relatively unexplored area. This study aims to explore the existence of distinct patterns of cortisol coordination throughout psychotherapy and test the associations of different coordination patterns with patients' pre-treatment characteristics and treatment progress measures.

METHODS

Fifty patient-therapist dyads participated in 16 weeks of psychodynamic treatment for major depressive disorder. Salivary cortisol samples were collected before and after each session at four time points. Self-report questionnaires and treatment session video-coding were used to characterize and differentiate between patterns of cortisol coordination.

RESULTS

Three patterns of cortisol coordination were identified: synchronized, unsynchronized and stable-therapist. These patterns differed in patient characteristics and treatment progress measures in that patients exhibiting a synchronized pattern tended to be more anxious and dominant in their relationships and were more prone to withdrawal ruptures.

CONCLUSIONS

Results provide novel evidence regarding variability in patient-therapist cortisol patterns and its putative associations with treatment progress.

Identification of dental calcification stages as a predictor of skeletal development phase

OBJECTIVE

This study aimed to establish a correlation between the stages of tooth calcification of mandibular canines and second molars with the phases of skeletal development.

METHODS

In a consecutive series of panoramic, cephalometric and hand-wrist radiographs of 113 individuals (60 females and 53 males) with an average age of 12.24 ± 1.81 years, the stages of mandibular canine and second molar calcification, cervical vertebrae maturation indicators (CVMI) and skeletal maturity indicators (SMI) were classified. The variables were correlated by means of the Spearman's Rank test: chronological age, SMI, CVMI and tooth calcification stages. In order to assess whether the CVMI and tooth calcification stages were significant predictors of the SMI, an ordinal regression analysis was carried out.

RESULTS

The stages of CVMI (OR = 16.92; CI 95% = 6.45-44.39; p< 0.001) and calcification of the second molars (OR = 3.22; CI 95% = 1.50-6.92; p= 0.003) were significant predictors of SMI, however similar result was not observed for canines (OR = 0.52, CI 95% = 0.18-1.54; p= 0.239). Calcification stage E for boys, and E and F for girls corresponded to the pre-peak phase of pubertal growth. Stages G and H for boys, and F and G for girls coincided with peak of growth. In the final growth phase, the majority of second molars presented with root apex closure (stage H).

CONCLUSION

The stages of calcification of the second molar may be considered predictors of the stage of skeletal development in the population studied.

New improved gamma: Enhancing the accuracy of Goodman-Kruskal's gamma using ROC curves

For decades, researchers have debated the relative merits of different measures of people’s ability to discriminate the correctness of their own responses (resolution). The probabilistic approach, primarily led by Nelson, has advocated the Goodman–Kruskal gamma coefficient, an ordinal measure of association. The signal detection approach has advocated parametric measures of distance between the evidence distributions or the area under the receiver operating characteristic (ROC) curve. Here we provide mathematical proof that the indices associated with the two approaches are far more similar than has previously been thought: The true value of gamma is equal to twice the true area under the ROC curve minus one. Using this insight, we report 36 simulations involving 3,600,000 virtual participants that pitted gamma estimated with the original concordance/discordance formula against gamma estimated via ROC curves and the trapezoidal rule. In all but five of our simulations—which systematically varied resolution, the number of points on the metacognitive scale, and response bias—the ROC-based gamma estimate deviated less from the true value of gamma than did the traditional estimate. Consequently, we recommend using ROC curves to estimate gamma in the future.

Funcionalidade familiar de idosos brasileiros residentes em comunidade

Resumo Objetivo Avaliar a funcionalidade familiar de idosos brasileiros; testar a influência de fatores determinantes. Métodos Estudo transversal com 2.052 idosos, a partir de dados coletados da linha base referente ao estudo “Aging, Gender and Quality of Life (AGEQOL)”, responderam questionários sobre funcionamento familiar; atividades básicas e instrumentais de vida diária (AVD e AIVD); estado cognitivo; e características sociodemográficas. Modelos multivariados de regressão ordinal e análise de correspondência múltipla identificaram fatores associados à boa funcionalidade familiar. Resultados A maior parte dos idosos gozava de boa funcionalidade familiar (76,3%), era casada e vivendo com cônjuge (55,5%), tinha mais de seis filhos e netos (85,4% e 76,7%, respectivamente) e independente para AIVD (71,5%). Análise de correspondência resultou em três grupos: alta, moderada e baixa funcionalidade familiar e perfil de idosos com distintas condições socioeconômicas. Conclusão Infere-se dos resultados implicações para a prática e política de atenção à família com membros idosos segundo seu funcionamento e distintas condições de vida e saúde das pessoas idosas.

Aging, Gender and Quality of Life (AGEQOL) study: factors associated with good quality of life in older Brazilian community-dwelling adults

BACKGROUND

In Brazil, a rapidly aging country suffering from large inequalities, the study of the quality of life (QOL) of aged people is important for the future health. The aim of this study was to examine the associations among QOL, gender, and physical and psychosocial health in older Brazilian community-dwelling adults to identify factors that are associated with better QOL.

METHODS

The "Aging, Gender and Quality of Life (AGEQOL)" study, which included 2,052 respondents aged 60 or older, was conducted in Sete Lagoas, Brazil between January and July 2012. The respondents answered questions regarding their socioeconomic and demographic information, health and social situations, cognitive impairment, depressive symptoms and family satisfaction. The authors also applied the Brazilian version the World Health Organization Quality of Life QOL Assessment-Brief Instrument (WHOQOL-BREF) and the World Health Organization Quality of Life Instrument-Older Adults Module (WHOQOL-Old). Ordinal logistic regression with the Proportional-Odds and Logit function was used to test the association between QOL and physical and psychosocial health according to age and socioeconomic status.

RESULTS

Older adults of both genders with five or more years of education, good self-rated health, an absence of depressive symptoms, and no family dysfunction reported better QOL. Retired men had a better QOL compared to non-retired men (OR = 2.2; 95% CI = 1.4-3.2), but this association was not observed in females. Men living in mixed arrangements (OR = 0.5; p = 0.033) and women who did not practice physical activity (OR = 0.7; p = 0.022) tended to have poorer QOL.

CONCLUSIONS

We conclude that there are gender differences related to better QOL in this sample. Women with good physical and psychosocial health are more likely to have a better QOL. For men, the best QOL was associated with high socioeconomic conditions and good physical and psychosocial health.

Fluency and belief bias in deductive reasoning: new indices for old effects

Models based on signal detection theory (SDT) have occupied a prominent role in domains such as perception, categorization, and memory. Recent work by Dube et al. (2010) suggests that the framework may also offer important insights in the domain of deductive reasoning. Belief bias in reasoning has traditionally been examined using indices based on raw endorsement rates—indices that critics have claimed are highly problematic. We discuss a new set of SDT indices fit for the investigation belief bias and apply them to new data examining the effect of perceptual disfluency on belief bias in syllogisms. In contrast to the traditional approach, the SDT indices do not violate important statistical assumptions, resulting in a decreased Type 1 error rate. Based on analyses using these novel indices we demonstrate that perceptual disfluency leads to decreased reasoning accuracy, contrary to predictions. Disfluency also appears to eliminate the typical link found between cognitive ability and the effect of beliefs on accuracy. Finally, replicating previous work, we demonstrate that cognitive ability leads to an increase in reasoning accuracy and a decrease in the response bias component of belief bias.

Satisfação com saúde bucal de idosos brasileiros: um estudo de gênero com modelo hierárquico

Os objetivos do presente estudo foram identificar as diferenças de gênero em relação aos fatores associados à satisfação com saúde bucal de idosos e estimar a prevalência de edentulismo por gênero e faixa etária. Foram incluídos 2.052 idosos com 60 anos e mais de idade, residentes em Sete Lagoas, Minas Gerais, Brasil. A regressão de Poisson foi utilizada para estimar a prevalência de edentulismo. A associação entre satisfação bucal e as variáveis independentes foi realizada por meio da regressão ordinal com modelo hierárquico multidimensional. A prevalência de edentulismo nos gêneros masculino e feminino foi de 63% e 68,8%, respectivamente. A maioria dos idosos do gênero masculino (63%) e feminino (57%) estava satisfeita com a saúde bucal. O modelo final ajustado, para ambos os gêneros, foi formado por variáveis referentes ao ambiente externo, comportamentos de saúde e condições de saúde bucal. Conclui-se que a satisfação com a saúde bucal é influenciada fortemente pelas condições de saúde bucal e por comportamentos de saúde, e que os fatores associados são diferentes para cada gênero.

In the mind of the market: theory of mind biases value computation during financial bubbles

The ability to infer intentions of other agents, called theory of mind (ToM), confers strong advantages for individuals in social situations. Here, we show that ToM can also be maladaptive when people interact with complex modern institutions like financial markets. We tested participants who were investing in an experimental bubble market, a situation in which the price of an asset is much higher than its underlying fundamental value. We describe a mechanism by which social signals computed in the dorsomedial prefrontal cortex affect value computations in ventromedial prefrontal cortex, thereby increasing an individual's propensity to 'ride' financial bubbles and lose money. These regions compute a financial metric that signals variations in order flow intensity, prompting inference about other traders' intentions. Our results suggest that incorporating inferences about the intentions of others when making value judgments in a complex financial market could lead to the formation of market bubbles.

Association between binge drinking, type of friends and gender: a cross-sectional study among Brazilian adolescents

BACKGROUND

Hazardous drinking among adolescents is a major public health concern. The purpose of this study was to examine the prevalence of binge drinking/alcohol consumption and its association with different types of friendship networks, gender and socioeconomic status among students in Belo Horizonte, Minas Gerais, Brazil.

METHODS

We conducted a cross-sectional study on a representative random sample of 891 adolescents (41% male, aged 15-19 years) from public and private schools in 2009-2010. Information on friendship networks and binge drinking was collected using two validated self-administered questionnaires: the Integrated Questionnaire for the Measurement of Social Capital and the first 3 items in the Alcohol Use Disorders Identification Test (AUDIT C). We used the area-based Social Vulnerability Index (SVI), mother and father's educational background, and the type of school to assess socioeconomic status. The chi-squared test was used to examine the associations between sample characteristics or the type of friends and binge drinking (p-values <0.05 were considered statistically significant). Ordinal logistic regression was used to estimate the association between binge drinking and the independent variables.

RESULTS

A total of 321 (36%) adolescents reported binge drinking (5 or more drinks in one occasion), and among them, 233 (26.2%) adolescents reported binge drinking less than monthly to monthly, and 88 (9.9%) weekly to daily. Binge drinking was associated with being male (OR = 1.52, 95% CI 1.01-2.28) and with living in a low vulnerability area (having the best housing conditions, schooling, income, jobs, legal assistance and health) (OR = 1.66, 95% CI 1.05-2.62). Students who reported that their closest friends were from school (as opposed to friends from church) had an increased risk of binge drinking (OR = 3.55, 95% CI 1.91-5.87). In analyses stratified by gender, the association was significant only among the female students.

CONCLUSIONS

The prevalence of binge drinking was high in this sample of Brazilian adolescents, and gender, low social vulnerability and friendship network were associated with binge drinking.

Optimism Facilitates the Utilisation of Prior Cues

It has been shown that optimists tend to rely more on their prior expectations than sensory input when making decisions of an intense nature (Geers & Lassiter, 2002). We investigated the degree to which this tendency persists over a range of discrepancies between prior cues and actual stimuli. Eighty–seven participants were shown a subset of happy, sad and fearful pictures drawn from the Ekman facial expressions of emotion (Ekman & Oster, 1979). Each picture was preceded by a verbal cue indicating the impending emotional expression and intensity. The displayed pictures were either in agreement, slightly discrepant or very discrepant with the cue. Participants rated the extent to which they agreed/disagreed with the expectation cue. Probit signal detection models were used to produce acquiescence for each subject at each level of discrepancy. Correlation analysis was performed on acquiescence and dispositional optimism scores. There was a significant correlation between all acquiescence scores for levels of discrepancies and dispositional optimism. Optimism appears to be a trait associated with acquiescence. The apparent tendency of optimists to comply may be due to a cognitive style that relies on expectations, such that it takes them longer to recognise the extent of discrepancy between expectations and incoming information. Copyright © 2010 John Wiley & Sons, Ltd.