ABSTRACT
Many studies have examined the prevalence rates of premenstrual symptoms and premenstrual syndrome (PMS) in cross-sectional population cohorts and selfpresenting clinical samples. Earlier studies included retrospective reports of PMS, either a ‘Do you suffer from PMS, yes or no’ or a one-time administered rating scale of premenstrual emotional, behavioral, and physical symptoms. The Premenstrual Assessment Form (PAF)1
is one retrospective questionnaire that has been utilized in some studies. Several studies have suggested that retrospective reporting amplifies the frequency and severity of premenstrual symptoms. The reasons for the possible amplification of symptoms are unclear. Symptom severity peaks on or just before the first day of menses,2-4 and the reporting of premenstrual symptoms may be influenced by menstrual cycle phase when questioned, wording of questions, expectations, and cultural issues.2
