Admission-Based Prevalence of Schizophrenia, Schizoaffective Disorder and Bipolar I Disorder in a Catchment Area in Sinop, Turkey.

OBJECTIVE: To provide registry-based prevalence estimates of schizophrenia, schizoaffective, and bipolar I (BPI) disorders in a defined area of Sinop, Turkey.

MATERIAL AND METHODS: All patients that presented to primary and secondary health services over three year time (2009-2011) with diagnosis of psychotic disorder (F06.1, F06.2, F10.5, F12.5, F19.5, F20-29, F30-31, F32.3, F33.3, F39 in ICD-10) covering a population of 73,503 aged 15-64 were included via case registry systems. All accessed case records were pooled. Case ascertainment and diagnostic assessment were achieved through structured clinical interview for DSM-IV, phone interview, or farming a best-estimated diagnosis via records on registers.

RESULTS: Registries provided 1,410 probable cases. The successful clinical reappraisal rate was 66.8% (n: 955) while, the final diagnoses were determined via phone interview or best-estimate diagnosis in the rest of the cases. Seven hundred twenty seven individuals were diagnosed with DSM-IV yielding a prevalence of 9.8 per 1,000 (95% confidence interval [CI]: 8.2-11.5). Registry-based prevalence of schizophrenia, schizoaffective disorder, BPI disorder, and depression with psychotic features were 3.6 (95% CI: 3.0-4.2), 1.1 (95% CI: 0.8-1.4), 2.7 (95% CI: 2.0-3.3), and 1.0 (95% CI: 0.6-1.3) per 1,000, respectively.

CONCLUSION: Ten individuals per 1,000 adult persons admit for any disorder with psychotic symptoms. Registry-based prevalence estimates are lower than the lifetime prevalence estimates. However, analyses of administrative data appear to provide information needed for effectively plan and implement psychiatric services.