Diagnostic criteria

The signs and symptoms of schizophrenia and related disorders are discussed in detail in ChapteĀ£.4.3.2. Also, the diagnostic process is described in general in ChaptĀ§L1.10..1. As noted, the signs and symptoms, weighted in terms of their typicality or specificity, combined with additional clinical factors such as onset, duration, social consequences, etc., are used to make a diagnosis of schizophrenia and subsequently to classify the disorder into subtypes. The DSM and ICD criteria are described below (Table...,1, Table..,.?, and T.a,b.le...,3).

Table 1 Tasks more or less likely to be affected in schizophrenia

Table 2 Criteria for the diagnosis of schizophrenia subtypes

Table 3 Terminology used to describe the course of schizophrenia in the DSM-IV and ICD-10 classifications

Another group of psychotic disorders which may be distinguished on the basis of formal phenomenological properties are the delusional disorders (3,.4) formally known as paranoia (see Chapter4.4).

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