| Literature DB >> 7446308 |
Abstract
Secular change in the seasonal distribution of menarche was studied in Tokyo on 17545 females born during 1881 - 1963. The distribution in those born before 1890 showed peak (March-May) and a wide trough during July-October. Occurrences of menarche came to concentrate in April and August after 1890, and also in January after 1950. The distributional pattern has much changed by the period of birth year.Keywords: Asia; Biological Characteristics; Biology; Demographic Factors; Developed Countries; Eastern Asia; Historical Survey; Japan; Menarche; Menstruation; Population; Population Dynamics; Reproduction; Seasonal Variation
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Year: 1980 PMID： 7446308
Source DB: PubMed Journal: Arztl Jugendkd ISSN： 0001-9518