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Table 2 Mean, standard deviation (SD), p-value, Cohen's d and 95% CI of measured and self-reported data

From: Validity and predictors of BMI derived from self-reported height and weight among 11- to 17-year-old German adolescents from the KiGGS study

Boys

11-13 years (n = 802)

14-17 years (n = 990)

 

Mean

SD

p 1

d 2

95% CI

Mean

SD

p 1

d 2

95% CI

Measured data

          

   Height (cm)

156.2

10.01

  

155.53-156.92

175.0

8.54

  

174.43-175.50

   Weight (kg)

48.4

12.65

  

47.52-49.28

67.1

14.43

  

66.16-67.96

   BMI (kg/m2)

19.6

3.64

  

19.35-19.86

21.8

3.95

  

21.56-22.05

Self-reported data

         

   Height (cm)

156.2

10.78

  

155.44-156.93

175.3

9.54

  

174.66-175.85

   Weight (kg)

47.5

12.17

  

46.64-48.32

66.8

14.19

  

65.89-67.66

   BMI (kg/m2)

19.3

3.64

  

19.04-19.54

21.7

3.85

  

21.41-21.89

Difference between self-reported and measured data

     

   Height (cm)

-0.04

4.82

0.825

0.00

-0.37-0.30

0.29

4.07

0.025

0.03

0.04-0.54

   Weight (kg)

-0.92

3.41

0.000

0.07

-1.15-(-0.68)

-0.28

4.37

0.041

0.02

-0.56-(-0.01)

   BMI (kg/m2)

-0.32

1.85

0.000

0.09

-0.45-(-0.19)

-0.15

1.84

0.008

0.04

-0.27-(-0.04)

Girls

11-13 years (n = 728)

14-17 years (n = 948)

 

Mean

SD

p 1

d 2

95% CI

Mean

SD

p 1

d 2

95% CI

Measured data

         

   Height (cm)

156.6

8.44

  

155.99-157.21

164.8

6.38

  

164.37-165.19

   Weight (kg)

49.7

12.49

  

48.82-50.64

59.7

11.57

  

58.91-60.38

   BMI (kg/m2)

20.1

3.92

  

19.81-20.38

21.9

3.91

  

21.68-22.18

Self-reported data

         

   Height (cm)

156.3

10.08

  

155.53-157.00

166.0

6.84

  

165.53-166.40

   Weight (kg)

48.7

12.58

  

47.74-49.57

59.0

11.20

  

58.29-59.72

   BMI (kg/m2)

19.8

3.98

  

19.48-20.06

21.4

3.68

  

21.16-21.62

Difference between self-reported and measured data

     

   Height (cm)

-0.33

4.80

0.060

0.04

-0.68-0.01

1.18

2.70

0.000

0.18

1.01-1.35

   Weight (kg)

-1.07

4.08

0.000

0.09

-1.37-(-0.77)

-0.64

2.45

0.000

0.06

-0.80-(-0.48)

   BMI (kg/m2)

-0.33

2.00

0.000

0.08

-0.48-(-0.18)

-0.54

1.23

0.000

0.14

-0.62-(-0.47)

  1. 1 paired samples t-test for difference from zero
  2. 2 Cohen's d value calculated as effect size