what is the proportion of girls in groups a b and c what is the difference between a first time point and a second timepoint difference in group a and b what is the percent of boys in the first timepoint how much does gender differences what is the difference between the first time point and the second timepoint percentage change between two timepoints what is the percentage for boys in a test how does the proportion of boys change as the second time point percentage of % change in gender what is the difference between a percentage change in time for boys and an equal percentage change in time for girls? what percent of boys are in a boys group what is the difference between genders in sex percentage of boys who are in group A what is the difference between boys and girls in age what are the proportions between a timepoint what is the difference between boys and girls how many percent change between two time points how much is the difference between boys and girls in proportion difference between boys and girls timepoint