The objective of this study was to analyze the sex ratio at birth and it´s related factors in Korea from the vital statisics of National Bureau of Statistics during 19 years (1972-1990). The results of this tudy are summarized as follows;
1. During the period of 1972-1990. the total case of birth registered were 14,669,372. The trends of sex ratio (male per 100 female) increased 103.99 in 1980, 109.64 in 1985 end 107.18 in 1990
2. In the level of sex ratio by the region during the period, the sex ratio was higher in Kyeong-nam, Kyeng-buk and Taegu city and lower in Kyeong-gi, Kand-won and Chum-nam(under 106).
3. The sex ratio at month of birth were 114.23 in January and 102.95 in November. The seasonality of sex ratio was higher in summer(110.6) and lower in autumn(107.60).
4. The sex ratio in the total cummulated birth cases(1972-1990) decreased with the increasing age of mother and birth order. On the otherhand, the period from 1980 to 1990, the sex ratio increased with the advancing maternal age and birth order.
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