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Table 6 Correction equations to estimate objectively-measured weight (Kg) using self-reported data

From: Measuring the bias, precision, accuracy, and validity of self-reported height and weight in assessing overweight and obesity status among adolescents using a surveillance system

  Girls Boys
  n (N)4 Correction Equation R2 n (N)4 Correction Equation R2
Grade=8 1
African American 832 (35290) 11.30+0.85 SRWeight 68.1% 720 (38025) 3.44+0.96 SRWeight 90.9%
Hispanic 3058 (104284) -0.04+1.02 SRWeight 82.0% 2817 (124777) 0.46+1.02 SRWeight 86.1%
White/Other 2 2992 (125746) 1.35+1.00 SRWeight 86.5% 3269 (136071) 1.41+0.99 SRWeight 88.2%
Grade=11 3
African American 608 (28565) 6.24+0.93 SRWeight 84.7% 506 (26932) -5.21+1.08 SRWeight 93.1%
Hispanic 1847 (71924) -1.28+1.03 SRWeight 91.9% 1714 (78732) 1.18+0.99 SRWeight 90.0%
White/Other 2 2520 (122353) -0.34+1.02 SRWeight 92.9% 2652 (146334) 2.07+0.97 SRWeight 88.4%
  1. [1] Grade 8 students had a mean age of 13.7 years old (SE=0.02) and their percentiles 25% and 75% are 12.7 and 13.7 years old, respectively
  2. [2] White/other category includes non-Hispanic White, Asian, Pacific Islander, Native American, and “other”
  3. [3] Grade 11 students had a mean age of 16.7 years old (SE=0.03) and their percentiles 25% and 75% are 15.7 and 16.7 years old, respectively
  4. [4] n = sample size; N = estimated population size using the sampling weights, R2 = coefficient of determination in percentage; SR = self-reported