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Table 1 Population Profile. Non-pregnant participants ages 16 and up in NHANES 1999–2013, complete data on BMI and weight perception. N = 37,281

From: Self-estimated BMI, but not self-perceived body size, accurately identifies unhealthy weight in US adults

  Underweight Normal weight Overweight Obese P-value for difference from normal weight
Underweight Obese
Percent of total 1.9 34 33 32
Date measured (years since 1999) 6.9 7.0 7.6 8.0 > 0.10 ***
Age, years 38 40 47 46 0.03 ***
Male 36 44 58 47 *** 0.001
Ethnicity 0.01 ***
 African-American 11 9.2 9.9 15 > 0.10 ***
 European-American 71 70 70 67 (ref) (ref)
 Hispanic 7.5 12 15 14 0.02 ***
 Other 11 9.0 5.4 3.9 > 0.10 ***
Household income as % of FMPI *** ***
  < 100 24 15 13 15 0.002 0.02
 100–200 25 19 19 22 0.04 > 0.10
 200–300 13 14 15 16 (ref) (ref)
 300–400 14 14 14 14 > 0.10 > 0.10
 400–500 9.0 10 11 11 > 0.10 > 0.10
  > 500 15 27 28 21 0.01 ***
Obesity class      n/a n/a
 1     59
 2 0 0 0 25
 3     17
Perceived body size n/a n/a
 Too small 56 10 1.0 0.54
 About right 43 73 39 8.6
 Too large 1.3 17 60 91
Self-estimated weight category based on BMI n/a n/a
 Underweight 67 1.2 0.02 0.008
 Normal weight 33 92 14 0.25
 Overweight 0 6.6 81 16
 Obese 0 0.14 4.3 84   
Measured BMI as % of self-estimated:
mean, 5th, 95th percentiles
97
87, 106
100
92, 108
102
95, 111
104
96, 116
*** ***
  1. Continuous measures expressed as mean unless stated otherwise. Binary measures expressed as %
  2. All p-values from survey-weighted logistic regression, with a binary outcome. P-value for top row of ethnicity, BMI category, and income is type 3 test of null hypothesis (all categories equal)
  3. P-value for each row of categorical measures is that for pairwise comparison with normal weight
  4. *** if p < 0.0001, n/a if not tested
  5. 1) P-value that people with overweight, obesity, or both groups differ from normal weight
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