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Women's beliefs about the prevalence of premenstrual syndrome and biases in recall of premenstrual changes.

The present study investigated the relationship between women's beliefs about the prevalence of premenstrual syndrome (PMS) and biases in recall of premenstrual changes. Forty-nine women completed the Moos Menstrual Distress Questionnaire (R. H. Moos, 1968) both retrospectively and prospectively. Afterward, they were asked about their beliefs concerning the prevalence of PMS. The women reported higher premenstrual changes when they completed the retrospective questionnaire. Seventy-five percent of the women believed that the majority of women have premenstrual changes. From this percentage, those who answered that the majority also experience PMS were more biased in their premenstrual changes in the retrospective assessment. Many women have a misperception about the meaning of PMS; consequently, they amplify their premenstrual changes in recall, reflecting women's cultural stereotypes rather than their actual experiences.