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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