Unadjusted median values, with 5^th and 95^th percentiles, with numbers of observations of anthropometry, physical activity, fitness, percent body fat and pubertal maturation stage classified by elementary school grade, gender and expressed as medians and percentiles.

1PAI is the physical activity index, approximately equal to the square root of average daily steps per day. CRF is cardiorespiratory fitness, the number of stages reached in the multistage run. %BF is percentage of body fat as determined by DXA scan. Tanner stage is the self-assessed pubertal stage ranking.