Table 1 Comparison of Cross-classification of measured BMI (kg m−2) and self-reported BMI for standard BMI categories: column % and s.e. in ()a

From: Temporal changes in bias of body mass index scores based on self-reported height and weight

Self-reported BMI

Measured BMI

 

Underweight <18.5

Normal weight 18.5<25

Overweight 25<30

Obesity I 30<35

Obesity II 35<40

Obesity III 40+

NHANES III 1988–1994

 <18.5

60.3 (3.7)

2.3 (0.3)

0.0 (0.1)

0.0 (0.1)

0.0 (0.0)

0.0 (0.0)

 18.5<25

39.1 (3.8)

90.9 (0.4)

18.3 (0.6)

1.2 (0.4)

0.3 (0.2)

0.0 (0.0)

 25<30

0.1 (0.1)

6.7 (0.5)

78.6 (0.7)

36.6 (2.1)

3.9 (0.6)

1.5 (0.9)

 30<35

0.5 (0.5)

0.0 (0.1)

3.0 (0.3)

60.1 (2.0)

41.2 (2.4)

9.3 (2.1)

 35<40

0.0 (0.0)

0.0 (0.1)

0.1 (0.1)

2.2 (0.4)

51.8 (2.4)

34.8 (3.9)

 40+

0.0 (0.0)

0.0 (0.0)

0.0 (0.0)

0.1 (0.1)

2.9 (0.8)

54.4 (4.1)

n=16 552; Population size=177 544 872

NHANES 2005–2008

 <18.5

58.9 (3.4)

1.7 (0.3)

0.1 (0.1)

0.0 (0.0)

0.0 (0.0)

0.0 (0.0)

 18.5<25

41.1 (3.4)

90.0 (0.7)

16.6 (0.8)

1.1 (0.2)

0.1 (0.0)

0.0 (0.0)

 25<30

0.0 (0.0)

8.3 (0.6)

78.7 (0.8)

27.1 (1.1)

3.1 (0.7)

0.8 (0.4)

 30<35

0.0 (0.0)

0.0 (0.0)

4.5 (0.4)

68.9 (1.0)

38.8 (1.3)

2.7 (0.9)

 35<40

0.0 (0.0)

0.0 (0.0)

0.1 (0.1)

2.5 (0.4)

55.5 (1.8)

25.0 (2.1)

 40+

0.0 (0.0)

0.0 (0.0)

0.0 (0.0)

0.1 (0.1)

3.7

71.7 (2.6)

n=10 700; Population size=204 730 330

  1. Abbreviations: BMI, body mass index; NHANES, National Health and Nutrition Examination Survey. Source: NHANESs, 1988–1994, 2005–2008. National Center for Health Statistics, CDC. Underlined percentages refer to sensitivity: the percent of respondents in the measured BMI categories, who are assigned to the same BMI category based on their self-reported BMI scores due to rounding, not all columns sum to 100%. Mantel–Haenszel estimate of average odds ratio in sensitivity difference between 2005–2008 and 1988–1994 controlling for measured BMI categories: 1.13, P<0.001.
  2. aMeasured BMI was calculated using physical measurements of height and weight; self-reported BMI was calculated using self-reported height and weight.
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