To examine the prevalence of obsessive-compulsive symptoms, we evaluated 69 outpatients with panic disorder. We found a 30% prevalence of obsessive-compulsive symptoms. The patients with obsessive-compulsive symptoms had an earlier onset of illness and were more likely to have current and past major depression than the other ones.

Traumatic or stressful life events have long been hypothesized to play a role in causing or precipitating obsessive-compulsive symptoms but the impact of these environmental factors has rarely been investigated using genetically informative designs. We tested whether a wide range of retrospectively-reported stressful life events (SLEs) influence the lifetime presence and severity of obsessive-compulsive symptoms (OCS) in a large Swedish population-based cohort of 22,084 twins. Multiple regression models examined whether differences in SLEs within twin pairs were significantly associated with differences in OCS. In the entire sample (i.e., both monozygotic [MZ] and dizygotic twin pairs), two SLEs factors, “abuse and family disruption” and “sexual abuse”, were significantly associated with the severity of OCS even after controlling for depressive symptoms. Other SLEs factors were either not associated with OCS (“loss”, “non-sexual assault”) or were no longer associated with OCS after controlling for depression (“illness/injury”). Within MZ pair analyses, which effectively control for genetic and shared environmental effects, showed that only the “abuse and family disruption” factor remained independently related to within-pair differences in OCS severity, even after controlling for depressive symptoms. Despite being statistically significant, the magnitude of the associations was small; “abuse and family disruption” explained approximately 3% of the variance in OCS severity. We conclude that OCS are selectively associated with certain types of stressful life events. In particular, a history of interpersonal abuse, neglect and family disruption may make a modest but significant contribution to the severity of OCS. Further replication in longitudinal cohorts is essential before causality can be firmly established.

The categorical definition of obsessive-compulsive disorder, and exclusive focus on thoughts and behaviors, have constrained the study and treatment of its symptoms. The present study’s aim was to search for relationships among emotional processing dimensions, five major personality dimensions, and self-perceived obsessive-compulsive symptoms. The participants were 100 college students, and the questionnaires used were a selection of images from the International Affective Picture System (IAPS), the Self-assessment Manikin (SAM), the Dimensional Obsessive-Compulsive Scale (DOCS), and the NEO-FFI. We found differences in emotional processing dimensions between participants with high and low DOCS scores, grouped according to sex (d = .56); and evidence that the neuroticism and agreeableness dimensions predict self-perceived obsessive-compulsive symptoms. Emotional processing dimensions and personality are considered useful to comprehending obsessive-compulsive symptoms, which lends support to dimensional models of OC symptomatology, as well as planning and developing psychological interventions.

Background: It has been suggested that magical thinking is related to both obsessions and compulsions in obsessive-compulsive disorder (OCD). Recent studies have indicated the significant relationship between level of religiosity and beliefs about the importance and need to control unwanted thoughts in OCD. People also use diverse strategies to control their unwanted thoughts. Aims: The present study aimed to examine the interrelationships between magical thinking and worry and punishment as thought-control strategies in mediating the relationship between religiosity and obsessive-compulsive (OC) symptoms in a Turkish sample. Methods: The sample of the present study was comprised of 179 non-clinical, community-based participants who completed measures of OC symptoms (measured with the Obsessive Compulsive Inventory — Revised), magical thinking (measured with the Magical Ideation Scale), religiosity, and thought-control strategies (measured with the Thought Control Questionnaire). Results: Both worry and punishment as thought-control strategies and magical thinking mediated the links between religiosity and OC symptoms. Furthermore, the relationship between religiosity and OC symptoms was mediated by magical thinking through punishment and worry. Conclusions: Findings pointing out the mediating role of magical thinking through punishment and worry in the relationship between religiosity and OC symptoms are novel and need to be replicated in future studies.

This study investigates the relative contribution of genetic and environmental factors to the stability of obsessive-compulsive (OC) symptoms in an adult population-based sample. We collected data from twin pairs and their siblings, using the Padua Inventory Revised Abbreviated, from the population-based Netherlands Twin Register (NTR) in 2002 (n = 10.134) and 2008 (n = 15.720). Multivariate twin analyses were used to estimate the stability of OC symptoms as a function of genetic and environmental components. OC symptoms were found to be highly stable, with a longitudinal phenotypic correlation of 0.63. Longitudinal broad sense heritability was found to be 56.0%. Longitudinal correlations for genetic (r = 0.58 for additive, r = 1 for non-additive genetic factors) and non-shared environment (r = 0.46) reflected stable effects, indicating that both genes and environment are influencing the stability of OC symptoms in adults. For the first time, evidence is reported for non-additive genetic effects on the stability of OC symptoms. In conclusion, this study showed that OC symptoms are highly stable across time in adults, and that genetic effects contribute mostly to this stability, both in an additive and non-additive way, besides non-shared environmental factors. These data are informative with respect to adult sample selection for future genetic studies, and suggest that gene–gene interaction studies are needed to further understand the dominance effect found in this study.

The present study examines the prevalence of obsessive-compulsive symptoms (OCS) in a population 1,061 adolescents (mean age 13.92) in Spain. The association between OCS and anxiety symptoms severity (panic attacks, separation anxiety, social phobia, generalized anxiety and school phobia) and depressive symptom severity has also been studied. Two distinct groups of subjects were defined and analyzed as being ‘positive’ on the obsessive-compulsive screen: The first group (called High interference) included all of the subjects who scored 25 or more in Leyton Obsessional Inventory-Child Version (LOI-CV) interference score regardless of symptom presence score, and the second group (labeled High symptom presence) consisted of all subjects with a symptom presence score equal to or above 15 and an interference score of 10 or less. Females scored higher than did males both on the symptom presence and interference scores. Forty- one subjects (3.9%) showed an interference score of 25 or more (high interference group) while eight students (0.8%) were included in the high symptom presence group. The most prevalent and interfering symptoms were: fussy about hands, hating dirt and contamination and going over things a lot. In addition, the association between LOI and depressive symptom severity was significant, while the association between LOI and anxiety symptoms severity was insignificant.

Background: There has been an increased effort to understand the nature of obsessive-compulsive disorder (OCD) in non-Western cultures. In particular, growing research has examined OCD in China, but there are no comprehensive instruments that measure both OCD severity and heterogeneity for characterizing samples. Aims: A validated, comprehensive measure that could be used in China would provide researchers with a useful instrument for evaluating severity and heterogeneity of OCD in a non-Western culture, allowing researchers to better understand the universal and cultural components that play a role in the nature of OCD. Method: The current investigation presents data on the reliability and validity of a Mandarin translation of the Obsessive-Compulsive Inventory-Revised (CH-OCI) using both a student (n = 1950) and clinical sample (n = 50 patients with OCD; n = 50 patients with anxiety as a comparison group). Results: Results support the factor structure, convergent and discriminant validity, criterion-related validity, test-retest reliability, and internal consistency of the CH-OCI. Conclusions: Validation of the instrument permits researchers and clinicians to measure OCD presentation in Mandarin-speaking samples.

Background: The Vancouver Obsessive Compulsive Inventory (VOCI) is a self-report measure of the severity of obsessive-compulsive problems such as contamination, checking, obsessions, hoarding, needing things to be just right, and indecisiveness. In the seminal paper a six-correlated-factor structure was found in a sample of OC patients, but the issue of the factor structure of the VOCI in non-clinical populations was not addressed. Aim: This study assesses the psychometric properties and the factor structure of the Italian version of the VOCI in a non-clinical sample. Method: The VOCI was administered to a large community sample (n = 445). Some participants also completed a battery including measures of OC behaviour, worry, anxiety and depression (n = 89) and were administered the VOCI twice at an 8-week interval (n = 46). Results: Confirmatory factor analyses replicated the six-correlated-factor structure originally found in a patient sample, but a more parsimonious, second-order-factor model showed a statistically higher fit, suggesting that VOCI subscales can be considered as facets of a higher-order OCD factor. The whole item pool and each of the subscales showed good internal consistency, unidimensionality, test-retest reliability and convergent construct validity. As in the original version, limited support for discriminant validity was found. Scores were weakly associated with age, gender and education. Conclusions: Although some key issues still need to be investigated (e.g. sensitivity to change), the VOCI seems to be a psychometrically sound instrument for the assessment of OCD-related behaviours and thoughts and can be used in cultural contexts different from the original.

According to the cognitive model, an inflated sense of responsibility is an important cognitive mediator both in the development and maintenance of obsessive-compulsive disorder (OCD). Empirical findings assign differential roles to responsibility in different kinds of obsessive-compulsive (OC) symptoms. However, findings that suggested a different function for responsibility revealed the need for an operational definition of responsibility and its multi-factorial structure. Few studies have examined the role of responsibility in OC symptoms in adolescents. The present study therefore aimed to explore responsibility concerns and to evaluate the relationship between responsibility dimensions and obsessive-compulsive symptom subgroups in two samples of adolescents and university students in a developing non-Western country. The findings suggested that the Responsibility Attitude Scale had a bifactorial structure, responsibility being based on self-dangerousness and prevention. Adolescents reported more responsibility in prevention and self-dangerousness than university students. The results appear to contribute to the symptom differentiation of OC behaviour by highlighting the importance of both dimensions of responsibility for checking symptoms, responsibility based on danger prevention for cleaning and, finally, responsibility based on self-dangerousness for obsessive thinking. Replication with clinical samples and different methodologies are encouraged.

Excessive responsibility has been proposed as a cognitive factor in obsessive-compulsive symptoms. In the present study the relationships of Salkovskis' measure of Responsibility Attitudes (RAS) (Salkovskis et al., 2000) with the total scale and the subscales of the PI-WSUR (Burns, Koertge, Formea, & Sternberger, 1996) measure of obsessive compulsive symptoms, as well as with a measure of depression (CES-D), were studied with a sample of 356 students (108 males and 248 females). As expected, the correlation between RAS and PI-WSUR was stronger than the correlation between RAS and CES-D, supporting the specific role of excessive responsibility in obsessive-compulsive symptoms. Among the subscales of PI-SWUR the strongest correlation of RAS was with Obsessional Thoughts About Harm to Self/Others (OTAHSO) and then with Checking. The OTAHSO was the only PI-WSUR subscale to show a significant partial correlation with RAS when other subscales and CES-D scores were taken into consideration. These results indicate that responsibility attitudes may play quite different roles in relation to different obsessive-compulsive symptom domains and that cognitive theory should take this more explicitly into account.

Relationships between obsessive-compulsive symptoms and several cognitive constructs that are theoretically related to such symptoms were investigated among university students. A total of 211 subjects filled in a measure of the frequency of intrusive thoughts based on Clark and de Silva (1985), Salkovskis' Responsibility Attitudes Scale (RAS) (Salkovskis et al., 2000), the Thought-Action Fusion Scale (TAF) (Shafran, Thordarson, & Rachman, 1996), Wegner and Zanakos' (1994) White Bear Suppression Inventory (WBSI), and the Maudsley Obsessive-Compulsive Inventory (MOCI) (Hodgson & Rachman, 1977). The main hypothesis addressed was that in accordance with Salkovskis' model (1996) responsibility and thought suppression serve as mediators between intrusive thoughts and obsessive-compulsive symptoms as measured with the MOCI. The results were consistent with the model.