Tourette syndrome (TS) is characterized by multiple motor tics plus one or more vocal
(phonic) tics, which characteristically wax and wane. It can no longer be considered the rare …

Background: Since the publication of the DSM‐IV in 1994, research on obsessive–
compulsive disorder (OCD) has continued to expand. It is timely to reconsider the nosology …

We have established a multisite, international database of 3500 individuals diagnosed with
Tourette syndrome (TS). The male: female ratio is 4.3: 1 for the total sample, with wide …

Obiective: Obsessive-conpulsive disorder encompasses a broad range of symptoms that rep-
resent multiple psychological domains, including perception, cognition, emotion, social …

Epidemiologic studies show that by late adolescence obsessivecompulsive disorder (OCD)
has a lifetime prevalence of 2% to 3%. The age of onset is earlier in boys than in girls, and …

OBJECTIVE: Obsessive-compulsive disorder (OCD) is a clinically heterogeneous disorder
with a bimodal age at onset and range of treatment outcomes. This study attempted to …

Objective: Understanding the interreiatedness of tics, obsessive-compulsive disorder (OCD),
and attention-deficit/hyperactivity disorder (ADHD) has been complicated by studying only …

Although obsessive-compulsive disorder (OCD) has long been a unitary diagnosis, there is
much recent interest in its potential heterogeneity, as manifested by symptom subgroups …

Obsessive-compulsive disorder (OCD) clinical presentation is remarkably diverse, and can
vary both within and across patients over time. This variability in the phenotypic expression …

The study aimed to compare male and female patients with obsessive-compulsive disorder
(OCD) across symptom dimensions, clinical course and comorbidity. A cross-sectional study …