Gender Parity Index, Labour Force Participation Rate, Ages 15-64 (Ratio)
Definition :

Ratio of labour force participation rate, female, ages 15-64 to labour force participation rate, male, ages 15-64.

Explanation :

A GPI of 1 indicates parity between the sexes; a GPI that varies between 0 and 1 typically means a disparity in favour of males; whereas a GPI greater than 1 indicates a disparity in favour of females.