A demographic term for the numerical or percentage difference between the numbers of males and females in each age group in the population. Unless distorted by selective abortion of female fetuses and/or female infanticide, the female-male gap at birth is about 5 to 6 per 100, i.e., there are about 105 to 106 male births for every 100 female births. A demographic profile in which there are 110 or more boys aged 5 to 9 years, or 10 to 14 years, per 100 girls is an indication of selective factors, such as abortion of female fetuses and/or female infanticide. The same term is used to describe other sex differences, e.g., in literacy levels, health status indicators.
Subjects: Public Health and Epidemiology.