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Specificity of Schneider's first rank symptoms for schizophrenia in Malay patients.

The frequency of Schneider's first rank symptoms (FRS) was studied in 221 Malay patients with functional psychosis. The prevalence of FRS in schizophrenia was 26.7%. The most common symptoms were voice arguing, passivity phenomena and somatic passivity. In the absence of organic brain dysfunction, the specificity of FRS for schizophrenia was 87.8%, and their positive predictive value was 90.6%. These findings indicate that although FRS is not pathognomonic of schizophrenia, their presence should be regarded as strongly suggestive of schizophrenia in the absence of organic etiology. FRS do not however occur with sufficient frequency to have potential diagnostic in schizophrenia.