There must be at least two symptoms of Sz, one of which must be hallucinations or delusions, over a period of six months, with persistent symptoms occurring in the last month.
The two widely used systems for diagnosing Sz are:
· The International Classification System for diseases (ICD) was developed by the World Health Organisation.
· The Diagnostic and Statistical Manual of Mental Disorders (DSM) was developed by the American Psychiatric Association (APA).
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