Table 2

Descriptive statistics of the potential confounders at baseline

n (%)MeanSDMedian (95% CI)Range
Sex (boys)84 (58.3)
Anthropometry
 Weight (kg)45.49.643.5 (42.2 to 46.5)27.2–90.5
 Height (cm)156.28.9156.5 (154.4 to 158.9)134.2–181.6
 BMI (overweight/obese)15 (10.4)
 Waist-to-height ratio0.440.040.43 (0.42 to 0.44)0.36–0.60
Contact/collision sport96 (66.7)
Physical fitness
 10×5 m shuttle run test (s)21.51.721.5 (21.1 to 21.7)17.6–25.1
 Handgrip strength test (kg)23.55.322.7 (21.5 to 23.4)13.1–42.1
 Andersen test (m)10219.41030 (1014 to 1040)800–1235
  • BMI, body mass index.