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Table 2 Comparisons between measured and self-reported weight at baseline

From: Self-reported and measured weights and heights among adults in Seattle and King County

  Baseline measured weight (kg) Baseline reported weight (kg)     
  Mean (SD) Mean (SD) Differencea 95 % CI P-Valueb P for trendc
Overall 81.17 (24.54) 79.82 (21.42) 1.35 (1.13,1.56) <0.001  
Age       
 21–49 80.41(21.62) 79.04(21.42) 1.37 (1.09,1.64) <0.001  
  ≥ 50 82.32(21.45) 81.01(21.45) 1.31 (0.96,1.67) <0.001 0.821
Gender       
 Men 90.67(21.32) 89.64(21.75) 1.03 (0.61,1.46) <0.001  
 Women 76.74(20.21) 75.25(19.70) 1.49 (1.24,1.74) <0.001 0.067
Race/Ethnicity       
 White 81.54(21.74) 80.22(21.74) 1.33 (1.10,1.56) <0.001  
 Non-white 79.11(20.46) 77.66(19.86) 1.45 (0.80,2.09) <0.001 0.722
Highest education       
  ≤ Some college 86.35(24.70) 84.62(24.60) 1.73 (1.24,2.22) <0.001  
 College graduates 78.27(19.01) 77.15(18.96) 1.13 (0.93,1.33) <0.001 0.024
Annual household income       
  < $50,000 86.87(24.53) 85.05(24.57) 1.82 (1.24,2.41) <0.001  
 $50,000–< $100,000 81.70(20.46) 80.51(20.38) 1.19 (0.86,1.52) <0.001  
  ≥ $100,000 76.18(18.97) 75.04(18.79) 1.13 (0.91,1.36) <0.001 0.031
BMI       
 Underweight or normal 63.36(8.51) 62.51(8.57) 0.86 (0.64,1.07) <0.001  
 Overweight 80.21(10.82) 78.74(10.89) 1.47 (1.11,1.84) <0.001  
 Obese 102.01(20.00) 100.22(20.50) 1.79 (1.28,2.30) <0.001 0.001
  1. aDifference = Difference between measured and self-reported weight
  2. b P-value = from paired t-test of mean difference (measured-self reported)
  3. c P-value = from linear regression comparing mean difference across a category, p-values <0.05 are in bold