A 20-item Heart Disease Locus of Control Scale was given to 50 health fair attenders and 51 nonattenders. The scale has three subscales: internal (7 items), chance (8 items), and powerful others (5 items). Reliability assessed by test-retest was .83 and Cronbach alphas for the subscales were internal .83, chance .86, and powerful others .76. Validity was examined through content validity, criterion-related validity, construct validity, and discriminant validity. Reading was at the ninth grade. It is recommended that the more specific Heart Disease Scale be utilized when conducting studies of heart disease.
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O’Connell et al. (1985) studied this question.
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