Demographic determinants of the sex ratio at birth in the Saguenay population Quebec.

摘要: For most human populations the sex ratio at birth defined as number of male births per 100 female is around 105. Several biological mechanisms have been suggested to explain remarkable constancy this ratio. Nonetheless notable variations from mean value observed in certain populations. Besides factors other demographic socio-economic characteristic also studied better understand these differences. Analysis over 20000 Saguenay region Quebec (Canada) during period 1850 1880 has revealed an unusually high more than 108. Subsequent analyses shown that persists beyond end nineteenth century and into a good part twentieth. The aim present study detailed examination ratios identification their possible determinants such parental age order prior length intervals seasonality. Certain family components examined using information on names (patronyms). (authors)