Using a parallel groups format with university females, different results were obtained with perceived rather than computed change measures. Subjects were classified into three groups according to their sexual and contraceptive experience. With computed change measures, no significant attitudinal changes were found when subjects (N = 91) viewed a birth control film. With perceived change measures, subjects (N = 103) indicated attitudes toward premarital sex and use of contraception had been reinforced by the film. Perceived measures appeared sensitive to aspects of change, particularly attitude reinforcement, which were not measured by computed change.
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