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Table 4 Summary of multivariate linear regression models for the difference between self-reported and measured BMI

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 (n = 1 792) Girls (n = 1 676)
  Model 1a Model 1b Model 1a Model 1b
  B p B p B p B p
Intercept -0.39   -0.34   -0.25   -0.27  
Age (in years)         
   11 0.00 ref. 0.00 ref. 0.00 ref. 0.00 ref.
   12 0.18 0.250 0.23 0.140 0.31 0.025 0.32 0.022
   13 0.36 0.021 0.39 0.015 0.06 0.687 0.06 0.669
   14 0.49 0.002 0.49 0.002 -0.08 0.572 -0.03 0.838
   15 0.34 0.031 0.31 0.058 -0.03 0.839 0.05 0.741
   16 0.45 0.006 0.45 0.006 -0.20 0.160 -0.14 0.338
   17 0.22 0.194 0.21 0.225 -0.07 0.647 0.02 0.884
Weight status (measured)        
   Underweight 0.64 0.000 not included
in the model
0.37 0.028 not included
in the model
   Overweight -0.87 0.000    -0.67 0.000   
   Normal weight 0.00 ref.    0.00 ref.   
Body perception         
   Too thin 0.03 0.825 0.20 0.101 0.10 0.531 0.24 0.085
   Too fat -0.11 0.360 -0.46 0.000 -0.17 0.057 -0.38 0.000
   Right weight 0.00 ref. 0.00 ref. 0.00 ref. 0.00 ref.
Symptoms of an eating disorder       
   Conspicous -0.07 0.572 -0.15 0.231 -0.12 0.171 -0.16 0.072
   Inconspicous 0.00 ref. 0.00 ref. 0.00 ref. 0.00 ref.
Parental overweight        
   Both -0.08 0.487 -0.21 0.084 not significant in
the univariate model
not significant in
the univariate model
   One 0.06 0.581 0.01 0.943     
   None 0.00 ref. 0.00 ref.     
R 2 0.068 0.037 0.062 0.037
  1. Model 1a: Multivariate model with measured weight status
  2. Model 1b: Multivariate model without measured weight status
  3. ref.= reference