Table 7.
Correction equations to estimate objectively-measured BMI (kg/m2) using self-reported data
| Girls | Boys | |||||
| n (N) | Correction Equation | R2 | n (N) | Correction Equation | R2 | |
| Grade=8 | ||||||
| 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 | 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 | ||||||
| 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 | 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% |
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
White/other category includes non-Hispanic White, Asian, Pacific Islander, Native American, and “other”
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
n = sample size; N = estimated population size using the sampling weights, R2 = coefficient of determination in percentage; SR = self-reported