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A self-administered, machine-scored test questionnaire to discriminate between men with the Type A coronary-prone behavior pattern and those without that pattern (Type B) was taken twice by over 2800 men in the Western Collaborative Group Study in 1965 and 1966. Optimal weighting, discriminant function, and factor analytic procedures were applied to these test items to produce scales measuring Behavior Type A, Speed and Impatience, Job Involvement, and Hard-Driving traits, respectively. In a retrospective study, 83 men who had sustained a first attack of CHD before taking the test in 1965 were compared with 468 random control subjects. The mean Type A score was significantly higher for cases than for controls (P=0.01). The mean Factor H score showed cases to be more hard-driving, competitive and responsible than controls (P=0.01). Contingency tables also supported these discriminations. The other two factor scales did not discriminate significantly.
Jenkins et al. (Sat,) studied this question.