Author:
Steinert Tilman,Hamann Karen
Abstract
Studies on violence in schizophrenia use two different approaches: use of epidemiological data, and clinical
studies recording direct patient data after gaining informed consent. With regard to informed consent requiring agreement
and cooperation, the question arises as to what extent participants represent patients with schizophrenia and violent behaviour
(external validity). We conducted a systematic literature research. In most of the studies, aggression or violence, respectively,
were poorly defined. Only 5 (15.2%) studies used a cut-off score on an aggression scale. Only 6 studies
(18.2%) reported the number of patients who refused to participate, and 16 (48.5%) reported the number of drop-outs.
Only 3 studies (9.1%) reported a systematic comparison of participants and non-participants. We found that data which allow
for the assessment of representativeness of the investigated samples are poorly reported. For most studies, doubts regarding
external validity seem justified and generalisability is questionable due to possible selection bias.
Publisher
Bentham Science Publishers Ltd.
Subject
Psychiatry and Mental health,Epidemiology
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