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Summary of I.C.D. - 10 Diagnostic Criteria
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The normal requirement for a diagnosis of schizophrenia is that a minimum of one very clear symptom (and usually two or more if less clear-cut) belonging as on of the groups listed a) to d) below, or symptoms of at least two of the groups referred to as e) to h), should have been clearly present for most of the time during a period of 1 month or more.....Symptom i) applies only to a diagnosis of simple schizophrenia.
- thought echo, thought insertion, or withdrawal, and thought broadcasting;
- delusions of control, influence, or passivity, clearly referred to body or limb movements or specific thoughts , actions or sensations; delusional perception;
- hallucinatory voices giving a running commentary on the patient's behaviour, or discussing the patient among themselves or other types of hallucinatory voices coming from some part of the body;
- persistent delusions of other kinds that are culturally inappropriate and completely impossible, such as religious or political identity, or superhuman powers and abilities (e.g. being able to control the weather, or being in communication with aliens from another world);
- persistent hallucinations in any modality, when accompanied either by fleeting or half formed delusions without clear affective content, or by persistent over-valued ideas. or when occurring every day for weeks or months on end;
- breaks or interpolations in the train of thought, resulting in incoherence or irrelevant speech, or neologisms;
- catatonic behaviour, such as excitement, posturing or waxy flexibility, negativism, mutism, and stupor;
- "negative" symptoms such as marked apathy, paucity of speech, resulting in social withdrawal and lowering of social performance; it must be clear that these are not due to depression or neuroleptic medication;
- a significant and consistent change in the overall quality of some aspects of personal behaviour, manifested as loss of interest, aimlessness, idleness, a self absorbed attitude, and social withdrawal.
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