Figure 6.

Moderated mediation. The moderator variable (Z) is the variety of regular physical activities, residualized with respect to the other physical activity measures. A, Simple mediation effects, at low (left, solid lines) and high (right, dashed lines) levels of the moderator (±1 SD from mean). B, The effect of the moderator on each individual and compound path in the model. Solid and dashed lines again indicate low and high levels of the moderator, respectively, as in A, with corresponding colors for the single paths. Final histogram represents the distribution of bootstrap samples used to calculate the p value for the moderation of the overall effect of age on IQ.