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  • Title: [Seasonal variation of menarche and month of birth (author's transl)].
    Author: Miura T, Shimura M, Nakamura I.
    Journal: Arztl Jugendkd; 1979 Feb; 70(1):37-40. PubMed ID: 539499.
    Abstract:
    Seasonal variations in the occurrence of menarche in 1226 Japanese girls are not uniform, when they were divided into two groups by their season of births. Summer trough (May-July) was inapparent in girls born in summer (May-October), and winter trough (February-March) was less deep in girls born in winter (November-April). No differences were found in fall trough (September-November) between both groups. Girls born in summer (or winter) seem to be resistant to some summer (or winter) factors, which inhibit the occurence of menarche.
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