生殖機能に関連する諸指標における母の出生季節による差異

抄録

Mean values and variances standardized for the mean value in some reproductive variables were compared between the mothers born in the summer (May-Oct.) and in the winter (Nov.-Apr.) who made deliveries in two different periods at a maternity hospital in Tokyo. Monthly number of births of mothers themselves was also compared with general birth distribution of the same cohorts in Tokyo.
Investigation was made for 11, 770 mothers who made deliveries in the 1930 s, when seasonal fluctuation of babies' births was most marked, and 4, 514 mothers who made deliveries in and after 1966, when seasonal fluctuation of babies' births was almost lost.
Summer-born mothers who made deliveries in the period with marked seasonal fluctuation of babies' births seemed to have been more severely selected for some reproductive functions than winter-born mothers.