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Table 5 Objective BMI classification as a function of subjective BMI and body image among 11- to 15-year-old adolescents in Germany, stratified by gender in KiGGS

From: Applying a correction procedure to the prevalence estimates of overweight and obesity in the German part of the HBSC study

aijKKiGGS* BMIKiGGSsub ϵ
I1 I2 I3 I4 I5 Q jk HBSC I1 I2 I3 I4 I5 Q jk HBSC I1 I2 I3 I4 I5 Q jk HBSC
  All Boys Girls
BMIKiGGS ϵ BI ¯ = 1 too thin
I 1 59.6% 15.4% 0.9%    17.8% 46.1% 16.1% 0.5%    14.8% 76.1% 14.5% 1.9%    22.3%
I 2 22.7% 42.3% 16.9%    22.0% 25.6% 44.0% 14.8%    16.4% 19.2% 39.8% 21.9%    30.4%
I 3 17.7% 42.3% 82.2% 100.0% 100.0% 59.7% 28.3% 39.9% 84.6% 100.0%   68.0% 4.7% 45.6% 76.2% 100.0% 1.8% 47.3%
I 4       0.4%       0.6%       0.0%
I 5       0.1%       0.2%       0.0%
BI ¯ = 2 exactly the right weight
I 1 20.5% 4.2% 0.1%   9.2% 5.2% 19.7% 9.2% 0.2%   7.6% 5.0% 23.2%      5.5%
I 2 39.5% 34.1% 1.6%    8.5% 31.5% 26.8% 1.3%    7.7% 68.3% 40.2% 1.9%    9.5%
I 3 40.0% 61.8% 96.6% 49.1% 67.9% 84.8% 48.8% 64.1% 96.0% 59.0% 68.5% 85.3% 8.5% 59.8% 97.3% 28.5% 65.8% 84.1%
I 4    1.8% 44.1% 22.9% 1.3%    2.5% 30.8% 19.4% 1.9%    0.9% 71.5% 34.2% 0.6%
I 5    0.0% 6.8%   0.2%    0.0% 10.2%   0.2%       0.3%
BI ¯ = 3 too fat
I 1 25.5%   0.1%    1.1% 31.5%   0.3%    1.1%       1.1%
I 2   19.6% 0.3%    1.7%       1.0%   26.4% 0.5%    2.1%
I 3 36.5% 80.4% 87.4% 8.2% 4.3% 78.6% 21.5% 100.0% 84.3% 9.0% 5.5% 73.0% 100.0% 73.6% 89.2% 7.2% 3.1% 82.3%
I 4 38.0%   11.0% 64.0% 11.2% 12.2% 47.0%   14.6% 59.9% 15.3% 16.0%    8.9% 68.9% 7.2% 9.6%
I 5    1.2% 27.8% 84.5% 6.5%    0.8% 31.1% 79.2% 9.0%    1.4% 23.9% 89.7% 4.8%
  1. * a ijK KiGGS = P BM I KiGGS I i BM I sub KiGGS I j , B I KiGGS = k
  2. BMIKiGGS: Body mass index.
  3. BMIKiGGSsub: Body mass index calculated from self-reported weight and height.
  4. I1 … I5: i-th category for BMI and j-th category for BMIsub (i.e., 1 = extremely underweight, 2 = underweight, 3 = normal weight, 4 = overweight, 5 = obese).
  5. BIKiGGS: Body image.
  6. QjkHBSC : Prevalences of the subjective BMI categories j in the group of people with Body Image BI = k in HBSC.