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Table 3 Actual BMI vs self-reported BMI by actual body type

From: Self-perceived vs actual and desired weight and body mass index in adult ambulatory general internal medicine patients: a cross sectional study

NIH BMI category Actual BMI, kg/m2a Self-reported BMI, kg/m2a Difference, kg/m2b P valuec
All patients (N = 508)     
  Underweight 17.3 ± 0.7 17.4 ± 0.8 −0.1 .70
  Normal 22.5 ± 1.6 22.2 ± 1.6 0.3 <.001
  Overweight 27.4 ± 1.4 26.7 ± 1.6 0.7 <.001
  Obese 35.1 ± 5.1 33.8 ± 4.9 1.3d <.001
Women (n = 257)     
  Underweight 17.3 ± 0.7 17.4 ± 0.8 −0.1 .70
  Normal 22.3 ± 1.6 22.0 ± 1.8 0.3 .001
  Overweight 27.2 ± 1.4 26.5 ± 1.6 0.7 <.001
  Obese 35.2 ± 4.4 34.1 ± 4.1 1.1d <.001
Men (n = 251)     
  Underweight NA NA NA NA
  Normal 23.0 ± 1.5 22.7 ± 1.3 0.3 .002
  Overweight 27.6 ± 1.4 26.8 ± 1.5 0.7 <.001
  Obese 35.0 ± 5.6 33.5 ± 5.4 1.5d <.001
  1. Abbreviations: BMI body mass index, NA not applicable, NIH National Institutes of Health.
  2. aValues shown are mean ± SD.
  3. bAnalysis of variance for trend of differences.
  4. cMatched pairs t test comparing actual BMI vs self-reported BMI by actual body type.
  5. d P < .001 using analysis of variance for trend of differences.