DSM criteria for diagnosis are based on "cluster analysis" which is where groups of symptoms are identified
Section 1: is an introduction to DSM 5 and an explanation of how to use the manual.
Section 2: lists the Diagnostic criteria and codes; This includes the 20 different categories under which disorders are listed with the criteria needed to diagnose them
For each disorder a set of diagnostic criteria explains what symptoms must be present and other disorders that must be ruled out to be diagnosed with schizophrenia
For SZ At least 2 of the following symptoms: Delusions, Hallucination, Disorganized speech, catatonic behaviour
At least 1 of the symptoms must be the presence of delusions, hallucinations, or disorganized speech.
Symptoms must persist for 6 months and these problems must not be attributable to another condition.