Spectral analysis of cyclic symptoms in late luteal phase dysphoric disorder.

Fifty-eight subjects self-referred for premenstrual difficulty were evaluated for late luteal phase dysphoric disorder through a spectral analysis technique applied to prospective symptom ratings. Data from the Schedule for Affective Disorders and Schizophrenia--Life-time Version were used to group the subjects according to the absence or presence of past or present psychiatric disorders. The two psychiatric groups were compared with regard to both patterns of significant symptom change and premenstrual symptom severity. Differences between the groups are used to discuss issues regarding the reliable identification of late luteal phase dysphoric disorder and the impact of other psychiatric disorders on this syndrome.