ReferencesI PERSKY M, O'BRIAN CP, KHAN MA: Reproductive hormone levels, sexual activity and moods during the menstrual cycle. Psychosom Med 38:62, 1976 z ABPLANALP JM, DONELLY AF, ROSE RM: Psychoendocrinology of the menstrual cycle. Psychmom Med 41587, I979 Mood and the menstrual cycle. Unpublished manuscript, 1981 4 DENNERSEIN L, ABRAHAM SF: Affective changes and the menstrual cycle. In: Handbook ofpsychiaw and endocrinology, PJV Beumont and GD Burrows (eds). Amsterdam, Elsevier, pp 367-400, 1982 Sexual arousability and the menstrual cycle. Psychosom Med 43:1gg, 1981 6 RUBLE D, BROOKSCUNN D: Menstrual symptoms: a social cognition analysis. J Behav Med 2:171, 1979 Menstrual cycle as focus of study and self-reports of mood and behaviour. Motiv and Emot 2:75, 1978 8 PARLEE MB: Changes in moods and activation levels 3 SANDERS D, WARNER P, BACKSTROM T, BANCROFT J: 5 SCHWNER-ENGEL P, SCHIAVX RC, SMITH H, WHlTE D: 7 ENGLANDER-GOLDEN P, WHITMORE MR, DIENSTBIER RA: during the menstrual cycle in experimentally naive subjects. In: The menstrualcycle (Vol I), AJ Dan, EA Graham and CP Beecher (eds). New York, Springer, pp 247-263, 1980 g ROSSI AS: Mood cycles by menstrual month and social week. In: Themenstrualcycle (Vol. I), AJ Dan, EA Graham, CP Beecher (eds). New York, Springer, pp 10 KRUSE JA, GOITMANN JM: Time series methodology in the study of sexual hormonal and behavioural cycles. Arch Sex Behav I I 405, 1982 I I WIEUND BA, MEFFERD RB: Identification of periodic components in physiological measurements. Psychophysiology 6:160, 19% form of electrolyte abnormalities or hepatic or renal function disturbances, were not seen. In this trial, progesterone 200 mg twice daily by the rectal route was not more effective than the placebo. J Psychosom Obstet Gynaecol Downloaded from informahealthcare.com by McMaster University on 11/03/14 For personal use only. There are no significant differences in the mean values for oestradiol, prolactin, FSH, and LH. The Journal of Psychosomatic Obstetrics and Gynaecology, 2-4 (1983) 221 J Psychosom Obstet Gynaecol Downloaded from informahealthcare.com by McMaster University on 11/03/14 For personal use only. SAMSON G: Premenstrual syndrome: a double-blind controlled trial of progesterone and placebo. Br J Psychiarr 135:2og, 1979 EW, BENEDEK-JASZMANN u: Plasma progesterone concentrations after high-dose suppositories. A preliminary report. Pharm Weekbl (Sci Ed) 4:135, 1982 BENEDEK-JASZMANN u: The premenstrual syndrome. J Drug Res 6361, ~wg I983 MEER YG VAN DER, LOENEN AC VAN, LOENDERSLOOT 222 Journal of Psychosomatic Obstetrics and Gynaecology, 2-4 (1983) J Psychosom Obstet Gynaecol Downloaded from informahealthcare.com by McMaster University on 11/03/14 For personal use only.