Figure 4.

Right-hand digit ratio age interaction and total surface area. Right-hand digit ratio moderates age-related differences in surface area growth in females. Plot shows quadratic mixed effect regression line for the effect of right-hand digit ratio with age. modx_group shows the values for digit ratio for which the lines are plotted. Actual data points are plotted as scatterplot on top of the interaction lines and the color of the dots are based on their right-hand digit ratio of the subjects.