• Mythily Subramaniam, Edimansyah Abdin, Janhavi Vaingankar, Saleha Shafie, Sherilyn Chang, Esmond Seow, Boon Yiang Chua, Anitha Jeyagurunathan, Derrick Heng, Kian Woon Kwok, and Siow Ann Chong.
• Research Division, Institute of Mental Health, Singapore.
• Ann Acad Med Singap. 2020 Jan 1; 49 (1): 15-25.

IntroductionUsing data from Singapore Mental Health Study 2016 (SMHS 2016), we examined the prevalence of lifetime and 12-month obsessive-compulsive disorder (OCD), its sociodemographic correlates and association with comorbid psychiatric disorders and physical conditions, perceived social support and quality of life.Materials And MethodsThe World Mental Health Composite International Diagnostic Interview (version 3.0) was administered by trained interviewers to 6126 residents aged ≥18 years old to assess OCD prevalence and that of other select psychiatric disorders. Details on sociodemographics, perceived social support and health-related quality of life were obtained.ResultsLifetime and 12-month prevalence of OCD was 3.6% and 2.9%, respectively. Adjusted regression analysis showed that those with OCD had significantly higher odds of major depressive disorder (odds ratio [OR], 5.4), bipolar disorder (OR, 8.9), generalised anxiety disorder (OR, 7.3) and alcohol abuse (OR, 2.7). OCD was significantly associated with suicidal ideation and suicidality (OR, 5.1). OCD subjects also had higher odds of chronic pain (OR, 2.4) and diabetes (OR, 3.1). Finally, OCD subjects had lower mean mental composite summary scores than controls (respondents without any of the psychiatric disorders and physical conditions included in SMHS 2016) and those with other lifetime psychiatric disorders and physical conditions.ConclusionOCD prevalence in Singapore is high. Most people with OCD do not seek treatment despite experiencing significant comorbidity and loss of quality of life.

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