Fig. 4.

Models of the mediation effect of aerobic fitness on the intervention effect (mean difference in change (c and c’ path)) on A) numeracy and B) reading performance among students in the Don’t worry – be happy (DWBH) intervention arm when compared with controls. All coefficients are unstandardized. Each model contained fixed effects for intervention, time (baseline – follow-up) and intervention × time interaction, in addition to random effects for school, class and subject ID. All models are adjusted for gender. CI: Confidence interval. Intra Class Correlation Coefficient for school (ICC)s: Model A: ICC: 0.08, Model B: ICC: 0.10.