Table 1. General characteristics of the sample.

	Total (n = 930)	Sports (n = 415)	Non-sports (n = 515)
Age (years)	12.3 (1.4)	12.3 (1.5)	12.3 (1.4)
Gender (males/females)	54.0/46.0	65.1/34.9	45.0/55.0
Body mass (kg)	51.2 (13.1)	50.6 (12.9)	51.8 (13.2)
Body height (m)	1.52 (0.14)	1.53 (0.14)	1.51 (0.14)
Body mass index (kg/m2)	22.2 (5.3)	21.5 (4.5)	22.9 (5.8)

Data are reported as mean (standard deviation), except for gender that percentage is reported instead.