性别比
2.These problems include the high sex ratio and the growing population aging.
3.A Study of Sex Ratio at Birth among Children Born Between 1910 and 1969
4.Remarkably high sex ratios at birth have been observed recently in Asian populations.
6.The prevalence of CHD for male(2.55%)was significantly lower than that for female(4.75%).
7.What happens to the sex ratio at birth if fertility is maintained at a low level depends on the evolution of son preference.
8.Terence H. Hull(1990), Recent Trends in Sex Ratio at Birth in China. United Nations, Economic and Social Commission for Asia and the Pacific.
9.The onset ages ranged from 10 to 85 years old, and 88.73% of the cases were at the age of 20 to 60 years old. Peasants accounted for 79.81%.
10.Conclusion: The birth sex ratio is a bit higher in this area as it is related to views of family planning, medical technology and some policies.
