All-China Women's Federation
According to the report published by All-China Women's Federation in 2011, among the total population identified as left-behind children, children age 0-5 take up 27.05%, age 6-11 take up 34.85%, and age 12-17 take up 38.11% of the children that are left behind. The male-to-female ratio in left-behind children population is 114:75, with boys comprising 53.63% and girls comprising 46.57% of the population.