Skip to main content

Table 3 Prevalence of weight status categories (Standard error of percent), absolute error and relative error

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

Weight Status1 Self-reported prevalence (%) Directly measured prevalence(%) Absolute Error(%)2 Relative Error3
  Girls Boys All Girls Boys All Girls Boys All Girls Boys All
8th Grade
Normal 69.9(2.33) 61.5(1.97) 65.5(1.69) 65.1(2.01) 63.0(2.21) 64.0(1.65) 4.8 -1.5 1.5 0.07 -0.02 0.02
Overweight 18.0(2.06) 21.2(1.67) 19.7(1.48) 18.8(1.73) 17.1(1.78) 17.9(1.26) -0.8 4.1 1.8 -0.04 0.24 0.10
Obese 12.1(0.71) 17.3(1.45) 14.8(0.95) 16.1(1.15) 19.9(1.47) 18.1(1.14) -4.0 -2.6 -3.3 -0.25 -0.13 -0.18
Overweight/Obese 30.1(2.33) 38.5(1.97) 34.5(1.69) 34.9(2.01) 37.0(2.21) 36.0(1.65) -4.8 1.5 -1.5 -0.14 0.04 0.04
11th Grade
Normal 76.0(1.76) 65.2(3.09) 70.3(2.20) 72.6(2.21) 63.2(2.82) 67.6(2.26) 3.4 2.0 2.7 0.05 0.03 0.04
Overweight 14.0(1.34) 16.6(1.85) 15.4(1.40) 15.7(1.61) 17.3(1.88) 16.5(1.55) -1.7 -0.7 -1.1 -0.11 -0.04 -0.07
Obese 10.0(0.97) 18.2(1.77) 14.3(1.09) 11.7(1.16) 19.5(1.70) 15.9(1.17) -1.7 -1.3 -1.6 -0.15 -0.07 -0.10
Overweight/Obese 24.0(1.76) 34.8(3.09) 29.7(2.20) 27.4(2.21) 36.8(2.82) 32.4(2.26) -3.4 -2.0 -2.7 -0.12 -0.05 -0.08
  1. [1] Using the U.S. Centers for Disease Control and Prevention (CDC) sex and age BMI growth charts, students are classified as underweight/normal (<85th percentile), overweight (≥85th percentile to <95th percentile) and obese (≥95th percentile) weight status categories.
  2. [2] Absolute error: Self-reported prevalence minus objectively-measured prevalence. Difference between error values given and error values calculated using prevalence in table are due to rounding of prevalence estimates.
  3. [3] Relative error: Absolute error divided by objectively-measured prevalence.