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Table 7 Correction equations to estimate objectively-measured BMI (kg/m2) 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 814 (34567) -5.94+0.32 SRWeight+27.31(1/SRHeight)2 65.9% 697 (37688) -12.82+0.32 SRWeight+43.58(1/SRHeight)2 83.8%
Hispanic 2879 (98951) -5.60+0.39 SRWeight+17.36(1/SRHeight)2 77.8% 2697 (121516) -6.11+0.34 SRWeight+22.24(1/SRHeight)2> 79.0%
White/Other 2 2945 (124790) -8.21+0.36 SRWeight+26.50(1/SRHeight)2 80.7% 3206 (133815) -10.71+0.32 SRWeight+36.18(1/SRHeight)2 78.1%
Grade=11 3
African American 603 (28479) -10.46+0.34 SRWeight+35.83(1/SRHeight)2 79.6% 494 (26523) -20.95+0.35 SRWeight+59.86(1/SRHeight)2 90.9%
Hispanic 1795 (70041) -5.88+0.36 SRWeight+20.75(1/SRHeight)2 83.3% 1671 (77409) -3.18+0.29 SRWeight+20.51(1/SRHeight)2 80.4%
White/Other 2 2498 (120375) -15.41+0.37 SRWeight+43.15(1/SRHeight)2 87.9% 2618 (143966) -16.78+0.31 SRWeight+55.83(1/SRHeight)2 84.7%
  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