Table 1 Description of students' mean age, Body Mass Index (BMI), and height by weight status grouping.

% of Sample (%, n)

100 (8550)

4.4 (378)

70.7 (6040)

18.3 (1566)

6.6 (566)

BMI in kg/m² (mean, SD)

20.4 (4.1)

15.1 (1.3)

19.0^a (2.2)

24.1^ab (2.3)

30.0^abc (4.1)

5661.75

***

Age in years (mean, SD)

12.8 (2.4)

12.8 (2.3)

12.8 (2.4)

12.9 (2.3)

12.8 (2.5)

1.17

NS

Height in cm (mean, SD)

155.4 (14.3)

151.6 (14.3)

154.6^a (14.5)

157.6^ab (13.3)

158.5^ab (13)

36.27

***

Boys height 6-12 yr (mean, SD)

146.4 (9.9)

141.9 (9.6)

144 ^a (10.6)

148.5^ab (10)

151^ab (9.4)

37.2

***

Boys height 13-18yr) (mean, SD)

168.4 (9.4)

163.6 (10.1)

168.9^a (9.4)

170.6^a (8.9)

170.6^a (9.1)

13.8

***

Girls height 6-12 yr (mean, SD)

145.0 (10.5)

140.3 (10.5)

143.8^a (10.7)

147.7^ab (10.7)

148.2^ab (10)

25.8

***

Girls height 13-18 yr (mean, SD)

162.1 (7.4)

160.5 (8.7)

161.9 ^a (6.9)

162.4^ab (6.6)

163.6^ab (7.5)

4.4

**