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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