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Table 1 Characteristics of measured and self-reported weight, height, BMI and prevalence of overweight by gender and age groups of schoolchildren

From: Validity of self-reported height and weight for estimating prevalence of overweight among Estonian adolescents: the Health Behaviour in School-aged Children study

 

Weight (kg) mean ± SD

Height (cm) mean ± SD

BMI (kg/m2) mean ± SD

Overweight %

Total group (n = 3379)

 Measured value

54.37 ± 13.60

163.7 ± 10.85

20.1 ± 3.52

17.08

 Self-reported value

52.94 ± 13.22*

163.1 ± 11.40*

19.7 ± 3.38*

13.50**

 Mean difference

−1.44 ± 3.98

−0.5 ± 3.48

−0.4 ± 1.65

 

Stratification by gender

  

 Boys (n = 1594)

   

  Measured value

56.55 ± 14.97

166.3 ± 12.41

20.2 ± 3.60

19.51

  Self-reported value

55.21 ± 14.51*

165.6 ± 13.06*

19.9 ± 3.41*

16.38**

  Mean difference

−1.34 ± 4.14

−0.8 ± 3.99

−0.3 ± 1.70

 

 Girls (n = 1785)

   

  Measured value

52.43 ± 11.92

161.3 ± 8.59

20.0 ± 3.44

14.85

  Self-reported value

50.91 ± 11.57*

161.0 ± 9.16*

19.5 ± 3.35*

10.92**

  Mean difference

−1.52 ± 3.83

−0.3 ± 2.94

−0.5 ± 1.60

 

Stratification by age and gender

 

 Age 11, boys (n = 479)

  

  Measured value

45.20 ± 10.69

153.1 ± 7.57

19.1 ± 3.39

23.38

  Self-reported value

43.32 ± 9.46*

152.2 ± 8.84*

18.6 ± 3.16*

19.00**

  Mean difference

−1.88 ± 3.67

−0.9 ± 5.01

−0.5 ± 1.82

 

 Age 11, girls (n = 592)

  

  Measured value

44.61 ± 10.49

153.8 ± 7.27

18.7 ± 3.34

17.74

  Self-reported value

42.51 ± 9.21*

152.9 ± 7.89*

18.1 ± 2.96*

12.33**

  Mean difference

−2.10 ± 4.09

−1.0 ± 3.38

−0.6 ± 1.78

 

 Age 13, boys (n = 560)

  

  Measured value

56.55 ± 13.51

166.8 ± 8.85

20.2 ± 3.77

20.00

  Self-reported value

54.96 ± 12.56*

165.8 ± 9.40*

19.9 ± 3.49*

16.43**

  Mean difference

−1.59 ± 4.61

−1.0 ± 3.89

−0.4 ± 1.84

 

 Age 13, girls (n = 573)

  

  Measured value

54.05 ± 10.86

163.3 ± 6.34

20.2 ± 3.46

15.53

  Self-reported value

52.45 ± 10.26*

163.0 ± 6.88

19.7 ± 3.45*

11.69**

  Mean difference

−1.59 ± 4.26

−0.2 ± 3.11

−0.5 ± 1.87

 

 Age 15, boys (n = 555)

  

  Measured value

66.34 ± 12.41

177.3 ± 6.61

21.0 ± 3.34

15.86

  Self-reported value

65.71 ± 11.69*

176.9 ± 7.16*

21.0 ± 3.15

14.05

  Mean difference

−0.63 ± 3.91

−0.4 ± 2.94

−0.1 ± 2.10

 

 Age 15, girls (n = 620)

  

  Measured value

58.43 ± 9.98

166.7 ± 6.26

21.0 ± 3.13

11.45

  Self-reported value

57.50 ± 9.71*

166.8 ± 6.19

20.6 ± 3.12*

8.87**

  Mean difference

−0.93 ± 3.82

0.1 ± 2.11

−0.4 ± 1.47

 
  1. Mean difference was obtained by subtracting measured value from self-reported value
  2. Overweight category includes obese adolescents, the IOTF cut-offs were used
  3. * Significant difference from respective measured value; paired t-test, p < 0.001
  4. ** Significant difference from the prevalence of overweight based on measured data; test for one proportion, P < 0.05