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Table 3 Comparisons between measured and self-reported weight at 12 months follow up

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

  12-month follow up measured weight (kg) 12-month follow up reported weight (kg)     
  Mean (SD) Mean (SD) Differencea 95 % CI P-valueb P for trendc
Overall 80.61(21.56) 79.64(21.40) 0.97 (0.74,1.21) <0.001  
Age       
 21–49 80.06(21.45) 79.25(21.42) 0.81 (0.48,1.15) <0.001  
  ≥ 50 81.45(21.76) 80.23(21.43) 1.22 (0.91,1.53) <0.001 0.077
Gender       
 Men 90.37 (21.19) 89.52 (21.43) 0.85 (0.37,1.33) <0.001  
 Women 76.07 (20.22) 75.04 (19.81) 1.03 (0.77,1.30) <0.001 0.507
Race/Ethnicity       
 White 81.03 (21.66) 80.00 (21.62) 1.04 (0.81,1.26) <0.001  
 Non-white 78.33 (21.00) 77.68 (20.22) 0.64 (−0.29,1.57) 0.172 0.411
Highest education       
  ≤ Some college 85.43 (24.41) 84.31 (24.41) 1.12 (0.64,1.61) <0.001  
 College graduates 77.92 (19.32) 77.03 (19.08) 0.89 (0.64,1.14) <0.001 0.410
Annual household income       
  < $50,000 86.01 (23.99) 84.94 (23.85) 1.08 (0.50,1.65) <0.001  
 $50,000–< $100,000 80.94 (21.00) 79.86 (20.87) 1.08 (0.72,1.44) <0.001  
  ≥ $100,000 76.07 (19.12) 75.28 (18.99) 0.79 (0.46,1.11) <0.001 0.355
BMI       
 Underweight or normal 63.49 (8.61) 63.01 (8.49) 0.48 (0.20,0.76) <0.001  
 Overweight 80.20 (10.00) 79.05 (10.25) 1.15 (0.68,1.62) <0.001  
 Obese 103.93 (20.08) 102.46 (20.58) 1.47 (0.96,1.97) <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