Figure 2.

Frequency polygons illustrating sex differences of body weight values (a and b) and their coefficient of variation CV as a measure of variability (c and d). Points and horizontal bars represent mean and standard deviation. (a) Distribution of individual values of 1,965 male (red) and 1,954 female (cyan) mice. Inset shows the 95% confidence interval for Cohen's d as an effect size estimate for the overall male–female difference (absolute value: <0.2 negligible, 0.5 medium, >0.8 large). (b) Distribution of male–female mean differences in 215 pairs of groups. Pairs with larger mean in males are to the right of the dashed line, those with larger mean in females to the left. (c) CV distribution in 215 male (red) and 215 female (cyan) groups. Inset shows the 95% confidence interval for Cohen's d as an effect size estimate for the overall male–female CV difference. (d) Distribution of the male–female CV difference in 215 pairs of groups. Pairs with higher variability in males are to the right of the dashed line, those with higher variability in females to the left