Table 1 Characteristics of the boys and girls studied

Median (p25 ; p75)*

Age (years)

11 (10;13)

12 (10;13)

0.53

BMI Z score

0.51 (-0.22;1.42)

0.21 (-0.41;0.96)

<0.001

Stature Z score

0.25 (-0.41;0.99)

0.11 (-0.52;0.79)

0.002

%

Excess weight

34.4

24.0

<0.001

Sexual Maturity Classification

0.94

Precocious

33.1

32.5

Late

32.2

32.7

Mother’s excess weight

31.0

33.4

0.31

Weight at birth (grams)

<0.001

< 2,500

5.8

8.3

≥ 4,000

14.4

8.1

Active commute to school

43.6

45.0

0.56

Type of school

0.97

Public

65.4

65.5

Private

34.6

34.5