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Table 1 Body mass index distribution per the IOTF classification as a function of age and sex

From: Prevalence of thinness and its effect on height velocity in schoolchildren

 

Thin (%)

Overweight (%)

Obese (%)

Extremely Obese (%)

Normal (%)

Females

 4–6 years (n = 1,976)

23.2

5.9

3.2

8.7

14.5

 7–9 years (n = 3,352)

32.4

15.4

15.5

18.2

23.6

 10–12 years (n = 3,492)

19.9

29.9

29.5

21.7

23.2

 13–15 years (n = 3,179)

12.1

29.5

30.5

27.8

21.5

 16–18 years (n = 2,513)

12.4

19.4

21.3

23.7

17.2

Peak (age) height velocity

6.5 ± 0.3 cm/years (at 13 years)

7.0 ± 0.3 cm/years at 11 years)

8.0 ± 0.3 cm/years (at 10 years)

7.1 ± 0.3 cm/years (at 11 years)

6.5 ± 0.3 cm/years (at 11 years)

Males

 4–6 years (n = 2,064)

25.2

4.7

2.8

7.8

15.5

 7–9 years (n = 3,683)

35.9

16.7

14.9

17.3

27.0

 10–12 years (n = 3,649)

18.7

31.5

30.9

21.7

26.2

 13–15 years (n = 2,902)

12.2

29.5

31.2

28.4

18.3

 16–18 years (n = 1,988)

8.0

17.5

20.4

24.8

12.9

Peak (age) height velocity

7.7 ± 0.3 cm/years (at 15 years)

6.3 ± 0.3 cm/years (at 12 years)

6.7 ± 0.3 cm/years (at 12 years)

6.4 ± 0.3 cm/years (at 11 years)

6.7 ± 0.3 cm/years (at 12–14 years)

  1. Peak group height velocity (mean ± standard error) and age at the peak height velocity after the age of 10. IOTF: International Obesity Task Force