Factors affecting the sex ratio are examined using data for 1,169,489 births occurring in rural and urban districts of Tehran, Iran, between 1971 and 1979. Attention is given to geographic, socioeconomic, psychological, and nutritional factors. It is found that "male births occurred more in Winter and Spring in the urban and rural areas, respectively. Female births occurred more in Fall in both urban and rural areas. Mean sex ratio was 108.20 in rural and 105.44 in urban areas." Reasons for the differentials between urban and rural areas are suggested.
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