Monthly Distribution of Korean and Japanese Births from the Eighteenth to the Twentieth Centuries.

概要

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We examined several data sources of biographic, family and hospital records to investigate seasonality of births in Korea and Japan during the 18th-20th centuries. It is well-known that the Japanese had an early spring peak of births during the first half of the 20th century. During the 17th-18th centuries, however, the Japanese showed two peaks of births in spring and autumn. The early spring peak (accompanied with an early summer trough) was prominent in Japan only from the 19th century to the middle of the 20th century, in which period the pattern was also observed in Korea, but only to a lesser extent. In Korea, the tendency still remained, or was rather augumented even in the 1970s, while it has virtually disappeared since the 1960s in Japan. Because it is believed the lifestyle of both countries has changed, despite of a time lag, toward a similar "deseasonalized" status, the recent difference in birth seasonalities in Korea and Japan would be derived from causes other than direct meteorological or socio-economical variables having caused the deseasonalization in both countries.
日本生気象学会の論文