Parameter estimates of the slope for the association between S4SF and MC at 6, 9, and 13 years of age. (a) Gray line: S4SF (exposure) and MC (outcome)&#59; (b) black line: MC (exposure) and S4SF (outcome). Adjusted for: group (intervention&#59; control), and pubertal status (prepubertal, initial puberty and puberty). S4SF, sum the four skinfolds&#59; MC, motor competence.