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An inventory containing 20 extraversion (E), 20 neuroticism (N) and 20 psychoticism (P) questions was administered to 1423 adult males, and 968 females, as well as to 1400 students of both sexes and to 327 housewives. Analysis by age, sex and social class showed that young people are high on E, high on N and high on P; that males are high on E, high on P, and low on N; and that middle‐class people are low on E, low on N, and low on P. Results were compared with previous findings, and with expectations from epidemiological research.
Eysenck et al. (Sat,) studied this question.