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Table 3 Distribution of those classified as overweight or obese at age 11 by chronological or biological age adjusted BMI categories at age 17

From: Does adjusting for biological maturity when calculating child weight status improve the accuracy of predicting future health risk?

  

Age 17

 

Age 11

Healthy weight

Overweight

Obese

BMI status using standard (chronological) age-matched norms

 Healthy weight

963 (90%)

85 (8%)

17 (2%)

 % boys/girls

91/90

8/8

1/2

 Overweight

79 (49%)

50 (31%)

33 (20%)

 % boys/girls

46/52

32/30

22/18

 With obesity

38 (23%)

30 (18%)

98 (59%)

 % boys/girls

19/28

19/17

62/55

BMI status using maturity adjusted (biological) age-matched norms

 Healthy weight

990 (89%)

101 (9%)

26 (2%)

 % boys/girls

90/88

9/9

2/3

 Overweight

76 (45%)

46 (27%)

46 (27%)

 % boys/girls

46/44

29/26

25/30

 With obesity

15 (14%)

18 (17%)

76 (70%)

 % boys/girls

11/19

19/11

69/70

  1. Figures in bold indicate the expected classification of the majority of children, if BMI status proved stable over time. For full-sample chronological cut-offs χ2 = 634 (4, 1) p < 0·001, for biological cut-offs χ2 = 611 (4, 1) p < 0·001