The factor structure of symptom reports in premenstrual syndrome

Premenstrual Syndrome (PMS) is characterised by negative moods, physical changes and alterations in cognitions and behaviours during the latter part of the menstrual cycle. Symptoms diminish at the onset of menstruation or during the menstrual flow and the post-menstrual (follicular) phase is usually one of calm and well-being. The factor structure of self-reports from a group of 75 treatment-seeking women was examined for simple structure. Five factors emerged, of which the first general factor was represented by follicular distress and accounted for 22% of the total variance. Four group factors emerged and were characterised as premenstrual negative feelings, premenstrual activation, premenstrual stress-pain, and follicular anxiety accounting for 30% of total variance. The finding of the large general factor with greatest weights on follicular distress items was of particular interest. This finding has implications both for aetiology of PMS and for therapy. These aspects are discussed.