ValleniBasile et al68 surveyed a community

sample of 3283 adolescents in the southeastern USA and found a 3% prevalence of OCD. They also identified a group of adolescents who had symptoms of OCD, but were not considered impaired. The prevalence of subclinical OCD, by this definition, was 19%. In a separate study, Valleni-Basile et al68 found that the 1-year incidence rate of OCD in this population was 0.7%. Interestingly, an initial S3I-201 manufacturer diagnosis of subclinical OCD was not significantly predictive of a diagnosis of OCD at 1-year follow-up. The authors concluded that an initial diagnosis of subclinical Inhibitors,research,lifescience,medical OCD was not a precursor to the development of clinical OCD with impairment of functioning. In the ECA study, prevalence rates of OCD were higher among women than men. However, when gender comparisons were controlled for marital status, employment status, job status, ethnicity, and age, there were no remaining differences in prevalence rates for women and men. In the Cross-national Collaborative Study, rates were generally Inhibitors,research,lifescience,medical higher in women, except in Munich, where the rates were higher among men. At least one prospective epidemiological study has suggested Inhibitors,research,lifescience,medical candidate risk factors for OCD. Crum and Anthony used data from the ECA study to estimate the degree to which the risk of OCD might be elevated among

adults actively using cocaine.69 Using 1-year prospective follow-up data, they identified 105 incident cases of OCD among 13 306 at-risk study participants. Subjects actively using cocaine were at substantially increased risk for OCD. In the Cross-national Collaborative Inhibitors,research,lifescience,medical Study, persons with OCD were found to have a substantially greater risk of having comorbid major depression or another anxiety disorder compared with persons Inhibitors,research,lifescience,medical without OCD across all sites, even though the comorbidity rates and the magnitude of the risk varied by site. The proportion of persons with OCD and any anxiety disorder was higher than the proportion with major depression

at all sites.70 Posttraumatic stress disorder Diagnosis PTSD is defined in DSM-III as a constellation of symptoms in response to a stressor, including reexperiencing a traumatic event, a numbing of responsiveness, and symptoms of an increased level of arousal.71,72 Thymidine kinase In DSM-III-R, the symptoms are required to persist for at least 1 month and the criteria are broadened by adding intense psychological distress in response to events that symbolize or resemble an aspect of the trauma and avoidance of stimuli associated with the event.73 In DSM-IV, the requirement for functional impairment or clinically significant distress is added.74 Symptoms (acute 2-4 weeks; chronic >4 weeks) Reexperiencing a traumatic event in recollections, dreams, flashbacks. Avoidance of stimuli associated with the event. Sleep disturbances, hypervigilance. Prevalence Until recently, accurate information on the prevalence of PTSD was not available.