Citation

Steinert T, Hamann K. Clin. Pract. Epidemol. Ment. Health 2012; 8: 74-80.

Affiliation

Centre for Psychiatry Suedwuerttemberg, Ulm University, Germany.

Copyright

(Copyright © 2012, Holtzbrinck Springer Nature Publishing Group - BMC)

DOI

10.2174/1745017901208010074

PMID

22934120

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.

Language: en