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By means of Allport's Religious Orientation Inventory (ROI) 145 students were classified as intrinsically religious and 133 as nonreligious. Personality differences between the two groups were explored on the basis of their scores on EPPS, the CPI, and 16 PF Questionnaire. Factor analysis of the combined 49 subscales of these three instruments produced eight factors: Achievement Potential, Self-Control, Social Ascendency, Affiliation, Personal and Social Adequacy, Egocentric Sexuality, Restlessness, and Stereotyped Femininity. Analyses of variance of the factor scores of the two groups of subjects showed significant differences on five of the eight factors, accounting for a total of 25% of the total variance. The intrinsically religious scored significantly higher on Self-Control, Personal and Social Adequacy, and Stereotyped Femininity; the nonreligious scored higher on Egocentric Sexuality and Restlessness. These results were discussed in relation to some of Allport's ideas on religion as a dimension of personality.
Edwin W. McClain (Sat,) studied this question.