The longitudinal (within-child) relationships between HOMA-IR and explanatory variables percent body fat, physical activity, cardiorespiratory fitness and body weight.

Adjustments were made for gender, school, socioeconomic status, pubertal rating and the logarithm of body weight, and relationships of IR with %BF were adjusted for PA index and vice versa. For the relationship with natural logarithm of body weight all other variables were ignored. The physical activity index is approximately the square root of average steps per day; CRF is cardiorespiratory fitness, the number of stages reached in the multistage run.