Table 1: Descriptive statistics for the variables included in this study, by sex.

VariableAll median (IQR)Boys median (IQR)Girls median (IQR)P for sex difference

Age (years)7.5 (7.2, 7.8)7.4 (7.2, 7.8)7.6 (7.2, 7.8)0.53
Height (cm)125 (122, 129)126 (122, 130)125 (121, 128)0.09
Shoulders (mm)279 (269, 291)279 (270, 291)278 (268, 290)0.51
Elbow (mm)52 (49, 54)52 (50, 55)51 (49, 53)0.001
Wrist (mm)42 (41, 45)43 (41, 45)42 (40, 44)0.07
Hip (mm)203 (194, 213)202 (194, 213)204 (195, 214)0.35
Knee (mm)77 (74, 80)78 (75, 82)75 (73, 79)<0.0001
Waist (cm)55.9 (53.0, 59.3)56.4 (53.3, 58.8)55.4 (52.5, 59.6)0.14
Subscapular skinfold (mm)6.6 (5.3, 9.6)5.8 (4.9, 8.2)7.7 (5.9, 10.5)<0.0001
Triceps skinfold (mm)10.5 (8.3, 13.4)9.0 (7.3, 11.7)11.6 (9.7, 14.3)<0.0001
Biceps skinfold (mm)6.1 (4.7, 8.2)5.5 (4.4, 7.3)6.7 (5.4, 8.7)<0.0001
Suprailiac skinfold (mm)7.9 (5.5, 11.9)6.7 (5.0, 10.1)9.5 (6.1, 14.0)<0.0001
Fat mass score0.44 (0.00, 0.94)0.54 (0.06, 1.01)0.39 (−0.03, 0.83)0.06
Lean mass score−0.20 (−0.80, 0.48)−0.30 (−0.89, 0.34)−0.07 (−0.68, 0.56)0.01
BMI (kg/m2)16.3 (15.2, 17.8)16.2 (15.3, 17.5)16.5 (15.2, 18.0)0.18

IQR: interquartile range.
BMI: body mass index.