Houde Jacobsen R. Hoekstra,"A statistical analysis of the effect of warfare on the human secondary sex ratio", Human Biology, 72 3pp. Rutstein,"Sex ratio unaffected by parental age gap", Nature,p.
Child mortality measures the share of newborns who die before reaching their 5th birthday. For births to be consistently male-biased, there must be gender differences in the probability of miscarriage through pregnancy. Help us do this work by making a donation. The cause-specific mortality rate is the mortality rate from a specified cause for a population.
The death-to-case ratio is the number of deaths attributed to a particular disease during a specified time period divided by the number of new cases of that disease identified during the same time period. Now compare these ratios to that of Indonesia in the second row below.
The neonatal mortality rate is usually expressed per 1, live births. The average natural sex ratio for humans from birth is approximately
As a general rule, the sex ratio is much more often above rather than below the "theoretical" value of Differences among the months are not statistically significant, but nonetheless note the difference between March and April. The Sex Ratio at Birth in the Saguenay Population, Quebec most of the variation in the sex ratio within or between populations, some of these factors could have a genetic or hereditary component that contributes to determining the sex at birth.
Birth intervals [link] 5. In light of the above findings it would be premature to try to identify only one or two factors that could explain the unusually high sex ratio values for the Saguenay population. Factors influencing the sex ratio at birth The sex ratio at birth SRB depends on the sex ratio at conception and sex- specific intrauterine mortality differentials.
Xu, M. Casgrain, M. The sex ratio of observed for the period approximately 48, births is particularly interesting.