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Table 1 Descriptive statistics of SPAN 2000-2002 and 2004-2005 by grade

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

Characteristic 2000-2002 2004-2005 All
  8th (n1=5362)
N1=(288584)
11th (n1=3576)
N1=(249363)
8th (n1=8827)
N1=(291672)
11th (n1=6456)
N1=(233753)
8th (n1=14189)
N1=(580256)
11th (n1=10032)
N1=(483116)
Age, y, mean(SE1) 13.7(0.03) 16.7(0.05) 13.7(0.04) 16.7(0.03) 13.7(0.02) 16.7(0.03)
Boys 54.6(3.05) 55.0(2.93) 50.8(1.26) 50.5(2.31) 52.7(1.60) 52.8(1.90)
Race/Ethnicity (%(SE1))       
African American 11.2(2.92) 9.2(2.41) 14.7(3.02) 14.2(2.69) 13.0(2.13) 11.6(1.77)
Hispanic 40.9(4.09) 26.9(3.71) 41.7(4.27) 36.9(2.65) 41.3(3.09) 31.7(2.76)
White/Other2 47.9(3.85) 63.9(4.80) 43.6(4.44) 48.8(3.78) 45.7(3.04) 56.6(3.40)
Self-Reported       
Height (cm) median(SE1) 161.6(0.41) 169.4(0.72) 160.9(0.75) 166.7(0.47) 161.3(0.43) 168.4(0.53)
Weight (Kg) median(SE1) 56.4(0.72) 65.8(0.93) 56.1(0.61) 65.2(0.74) 56.3(0.56) 65.6(0.61)
BMI (Kg/m2) median(SE1) 21.1(0.26) 22.6(0.14) 21.2(0.21) 22.7(0.28) 21.1(0.16) 22.6(0.18)
Weight status (%)3       
Normal 65.1(2.50) 72.7(3.57) 65.7(2.35) 67.7(1.56) 65.4(1.69) 70.3(2.20)
Overweight 19.5(2.52) 15.1(2.53) 20.0(1.68) 15.7(0.90) 19.7(1.48) 15.4(1.40)
Obese 15.4(1.54) 12.2(1.43) 14.3(1.21) 16.6(1.30) 14.8(0.95) 14.3(1.09)
Objectively-measured       
Height (cm) median(SE 1) 162.2(0.36) 169.5(0.49) 162.2(0.41) 167.3(0.46) 162.2(0.27) 168.6(0.45)
Weight (Kg) median(SE 1) 57.5(0.49) 66.4(0.78) 56.9(0.45) 65.1(1.08) 57.1(0.38) 66.1(0.71)
BMI (Kg/m2) median(SE 1) 21.4(0.36) 22.9(0.18) 21.6(0.20) 23.2(0.26) 21.5(0.18) 23.1(0.16)
Weight status (%)3       
Normal 63.5(2.48) 68.8(3.90) 64.5(2.39) 66.4(1.98) 64.0(1.65) 67.6(2.26)
Overweight 17.8(2.17) 16.8(2.66) 18.0(1.38) 16.3(1.60) 17.9(1.26) 16.5(1.55)
Obese 18.7(1.69) 14.5(1.64) 17.5(1.62) 17.3(1.35) 18.1(1.14) 15.8(1.17)
  1. [1] n represents the sample size in the survey and N indicates the estimated population size using the sampling weights. SE: Standard error.
  2. [2] White/other category includes non-Hispanic White, Asian, Pacific Islander, Native American, and “other”
  3. [3] Using the U.S. Centers for Disease Control and Prevention (CDC) sex and age BMI growth charts, students are classified into underweight/normal (<85th percentile), overweight (≥85th percentile to <95th percentile) and obese (≥95th percentile) weight status categories.