Table 1 Characteristics of participants (n = 1019)

Boys (n = 486)

Age (year)

10.6,

0.6

Height (cm)

141.9,

7.8

142.0,

7.5

-0.13,

2.3

-12.3

9.3

0.097

0.96

Weight (kg)

36.2,

8.2

36.3,

8.5

-0.09,

1.7

-10.7

10.0

0.114

0.98

BMI (kg/m²)

17.9,

3.0

17.9,

3.1

0.01,

1.0

-5.7

4.6

0.456

0.95

Body constitution^e

Underweight

52

(10.7)

60

(12.3)

Normal weight

365

(75.1)

357

(73.5)

Overweight

69

(14.2)

69

(14.2)

Girls (n = 533)

Age (year)

10.6,

0.6

Height (cm)

143.4,

7.6

143.3,

7.6

0.09,

1.5

-6.6

18.6

0.078

0.98

Weight (kg)

36.2,

7.7

36.4,

8.1

-0.14,

2.0

-14.5

11.9

0.046

0.97

BMI (kg/m²)

17.5,

2.5

17.5,

2.7

-0.07,

1.0

-6.3

6.2

0.039

0.94

Body constitution^e

Underweight

80

(15.0)

71

(13.3)

Normal weight

404

(75.8)

405

(76.0)

Overweight

49

(9.2)

57

(10.7)