Biomedical subjects

Kevin D Wu

Publications and source records attributed to Kevin D Wu.

6 recordsLinked to original sources

PubMed2006

A self-report version of the Yale-Brown Obsessive-Compulsive Scale Symptom Checklist: psychometric properties of factor-based scales in three samples.

Current research in Obsessive-Compulsive Disorder (OCD) recognizes substantial symptom heterogeneity and emphasizes dimensional assessment of core domains. This study administered a self-report version of the Yale-Brown Obsessive-Compulsive Scale Symptom Checklist to OCD patients (n=53), non-OCD psychiatric patients (n=96), and students (n=419). Factor analyses of category- versus item-level data produced different solutions (4 or 5 vs. 3 factors, respectively), but support a multidimensional framework for OCD symptoms. For between-groups analyses, the two patient groups scored significantly higher than students on nearly all dimensions. However, OCD and non-OCD patients differed significantly only on Symmetry/Ordering symptoms. These findings provide novel data concerning this instrument and suggest that most of its scales may not distinguish OCD patients clearly when administered in this manner. We provide recommendations for improving subsequent self-report versions but caution users not to over-extend its intended use.

Adolescent↗

PubMed2005

Relations between Obsessive-Compulsive Disorder and personality: beyond Axis I-Axis II comorbidity.

Most research on relations between Obsessive-Compulsive Disorder (OCD) and personality addresses only comorbidity rates between OCD and Obsessive-Compulsive Personality Disorder (OCPD). We first investigated empirical OCD-OCPD relations, but then also examined patterns of dimensional traits in OCD patients versus students and general outpatients. Results did not support a specific OCD-OCPD relation and the implications of this conclusion are discussed. Regarding traits, OCD patients shared with other patients elevated negative affectivity and lower positive affectivity. Differences on several lower order dimensions, including lower scores on manipulativeness, mistrust, and disinhibition distinguished the personality profile of OCD patients from others. Also noteworthy was a pattern of very low self-image for OCD patients, as suggested by the combination of low self-esteem and low entitlement scores. Overall, OCD patients showed a more specific pattern of personality pathology than did general outpatients, who were elevated more generally across personality disorders and negative affectivity scales.

Adult↗

PubMed2005

Hoarding and its relation to obsessive-compulsive disorder.

Although hoarding is observed in some patients with obsessive-compulsive disorder (OCD), it has not been shown to share a specific relation with OCD. Across two studies, we found that (a) whereas the classic OCD symptoms of checking, rituals, and contamination intercorrelated consistently strongly with one another, hoarding related only moderately to both these OCD symptoms and to depression; (b) OCD patients were distinguished from both other patients and non-patients by classic OCD symptoms, but not by hoarding; and (c) whereas OCD symptoms showed consistent relations with Negative Affect, hoarding largely was uncorrelated with this dimension. These results do not support a specific OCD-hoarding relation but rather call into question the trend of considering it a specific symptom of OCD.

Adolescent↗

PubMed2005

Development and validation of the Schedule of Compulsions, Obsessions, and Pathological Impulses (SCOPI).

This article describes a factor analytically derived, self-report instrument-the Schedule of Compulsions, Obsessions, and Pathological Impulses (SCOPI)-using data from college students, adults, psychiatric outpatients, and patients with obsessive-compulsive disorder (OCD). The five SCOPI scales all are internally consistent (with coefficient alphas of .80 and higher) and are strongly stable across a 2-month interval (with retest correlations ranging from .79 to .82). They also show good convergent and adequate discriminant validity (a) when correlated with other OCD measures and (b) in analyses of self-ratings versus spouse ratings. Additional analyses indicate that three scales-Obsessive Checking, Obsessive Cleanliness, and Compulsive Rituals-assess core symptoms of OCD. The two remaining scales-Hoarding and Pathological Impulses-appear to tap different (but related) constructs.

Adult↗

PubMed2004

Symptom subtypes of obsessive-compulsive disorder and their relation to dissociation.

We examined relations between obsessive-compulsive disorder (OCD) symptoms and dissociation in three studies. Studies 1 and 2 established a strong level of convergence between our two OCD symptom measures. Specific types of symptoms showed a clear convergent/discriminant pattern, indicating that they can be meaningfully distinguished from one another. In both studies, dissociation correlated more strongly with checking and obsessive intrusions than with cleaning, ordering, and hoarding. Moreover, these associations remained substantial even after controlling for neuroticism (Study 1) and other types of anxiety (Study 2). In Study 3, we replicated our key findings in a psychiatric outpatient sample, indicating that they are generalizable to clinical participants. Taken together, our results (a) establish a strong link between dissociation and OCD, and (b) illustrate the importance of analyzing different types of OCD symptoms separately.

Adult↗

PubMed2003

Further investigation of the obsessive-compulsive inventory: psychometric analysis in two non-clinical samples.

The obsessive-compulsive inventory [OCI; Psychol. Assessment 10 (1998) 206-214] is a self-report measure of obsessive-compulsive disorder (OCD) intended for use with both clinical and non-clinical samples (). Two reports support its convergence with established measures of OCD and its assessment of specific symptom subtypes (e.g., checking and washing). The current studies investigate the OCI factor structure in two non-clinical samples. Based on correlational analyses and complementary factor analyses, Study 1 results indicate that five subscales, rather than the seven rationally derived ones, best capture the structure of symptoms measured by the OCI. These findings were replicated in Study 2. Based on these analyses, we offer suggestions for revising the original subscales into these five empirically derived subscales that closely resemble structures proposed in the current OCD literature.

Adult↗