A study was conducted to investigate the validity of the Psychoticism scale of the Eysenck Personality Questionnaire and to test a criticism stating that the scale is overloaded with paranoid items. The questionnaire was administered to 31 hospitalized psychiatric patients and 20 normal aids. A planned comparison between the scores of normals and psychotics was significant but that between the 10 paranoid and 21 nonparanoid schizophrenics was not. This is consistent with the validity of the Psychoticism scale and suggests that it is probably not overloaded with paranoid content.
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