This page has a list of countries by School life expectancy, primary, gender parity index (GPI), according to officially-recognized international sources compiled by the World Bank. Ratio of female school life expectancy to the male school life expectancy. It is calculated by dividing the female value for the indicator by the male value for the indicator. A GPI equal to 1 indicates parity between females and males. In general, a value less than 1 indicates disparity in favor of males and a value greater than 1 indicates disparity in favor of females.