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Background: Obsessive-compulsive disorder (OCD) is characterized by five major dimensions, including contamination/washing, harm/checking, symmetry/ordering, hoarding, and forbidden thoughts. How these dimensions may relate etiologically to the symptoms of other obsessive-compulsive related disorders (OCRDs) and anxiety disorders (ADs) is not well known. The aim of this study was to examine the genetic and environmental overlap between each major obsessive-compulsive dimension with the symptoms of other OCRDs and ADs.Methods: Two thousand four hundred ninety-five twins of both sexes, aged between 18 and 45 years, were recruited from the Australian Twin Registry. Measures used scores on four dimensions (obsessing (forbidden thoughts), washing, checking, and ordering) of the Obsessive-Compulsive Inventory-Revised, Dysmorphic Concerns Questionnaire, Hoarding Rating Scale, Anxiety Sensitivity Index, Social Phobia Inventory, and Stress subscale of the Depression, Anxiety, and Stress Scale. Multivariate twin modeling methods using continuous and categorized variables were performed, also controlling for age and gender.Results: Our findings suggested that forbidden thoughts and washing demonstrated the strongest genetic overlap with other AD symptoms, while ordering was genetically related to OCRD symptoms. Common genetic influences on checking symptoms were best estimated when modeling OCRDs together with AD symptoms. Common environmental factors of ordering and checking were shared with AD symptoms.Conclusions: Important shared genetic and environmental risk factors exist between OCD, OCRDs, and ADs, but which vary alongside the expression of its major dimensions. [ABSTRACT FROM AUTHOR]

There has not been a comprehensive comparison of differences between men and women with body dysmorphic disorder (BDD) for approximately two decades. Major social and technological changes over this time may have changed patterns of bodily concerns and symptom profile among men and women with BDD, thus warranting an updated assessment of gender differences. BDD symptomatology, insight, and associated clinical and sociodemographic characteristics were compared between 49 women and 27 men with BDD. Skin was the most common concern for both men and women. Women showed more concerns than men about the appearance of their legs. Men were more concerned about muscularity/body build. Women demonstrated significantly more severe distress associated with BDD behaviours, and poorer illness insight than men. Age at BDD onset, illness duration, as well as mean severity of depression, anxiety, stress, and social anxiety were similar across the genders. These data suggest that the most common body areas of concern in people with BDD have not dramatically changed over the past two decades. However, the finding of worse insight among women is novel, and suggests a need for further investigation., (Copyright © 2020. Published by Elsevier B.V.)

Body dysmorphic disorder (BDD) is marked by high distress and behavioral and functional impairments due to preoccupation with perceived appearance anomalies. Our aim was to examine parental correlates of offspring's symptoms characteristic of BDD, testing both direct associations and indirect associations via appearance-based rejection sensitivity (appearance-RS). Surveys were completed by 302 Australian adolescents (9-14 years) and their parents. Findings indicated parents' weight and appearance teasing and child-report (but not parent-report) of parental negative attitudes about weight and appearance were uniquely associated with offspring's heightened BDD-like symptoms, and associations were partially indirect via adolescents' appearance-RS. Findings support theory that identifies parents as socializers of children's appearance concerns, and show that BDD-like symptoms may be partly elevated because of the mediating role of appearance-RS. We propose that BDD symptoms could partly emerge as compensatory responses to parents' appearance messages, and the associated bias to expect and perceive rejection based on one's appearance., (Copyright © 2017 Elsevier Ltd. All rights reserved.)