Table 3: Prevalence of obesity, by sex and age, as determined using the different sets of criteria.

Prevalence of obesity (95% CI) McNemar test for comparison of proportions returned by the different sets of criteria
SPA*95% CIIOTF95% CIWHO95% CISPA-WHO IOTF-WHO SPA-IOTF

Both sexes
 All7,65916.8(16.0–17.6)11.0(10.3–11.7)18.3(17.4–19.2)<0.001<0.001<0.001
 6 years1,82911.5(10.0–12.9)10.4(9.0–11.8)15.0(13.4–16.6)<0.001<0.0010.016
 7 years1,86115.8(14.1–17.4)12.4(10.9–13.9)19.1(17.3–20.9)<0.001<0.001<0.001
 8 years1,96118.0(16.3–19.7)10.4(9.1–11.8)19.0(17.3–20.7)0.001<0.001<0.001
 9 years2,00922.4(20.3–24.5)11.4(9.8–13.0)20.9(18.8–23.0)<0.001<0.001<0.001
Boys
 All3,93119.3(18.0–20.5)10.9(9.9–11.8)20.9(19.6–22.2)<0.001<0.001<0.001
 6 years92714.0(11.8–16.2)9.9(8.0–11.8)16.3(14.0–18.7)<0.001<0.001<0.001
 7 years95418.6(16.2–21.1)12.8(10.7–14.9)22.1(19.5–24.8)<0.001<0.001<0.001
 8 years1,01820.2(17.7–22.7)10.1(8.2–11.9)21.5(19.0–24.1)0.001<0.001<0.001
 9 years1,03223.6(21.0–26.2)10.7(8.8–12.6)23.2(20.6–25.8)0.344<0.001<0.001
Girls
 All3,72814.2(13.1–15.3)11.2(10.2–12.2)15.5(14.4–16.7)<0.001<0.001<0.001
 6 years9018.8(7.0–10.7)10.9(8.9–12.9)13.6(11.4–15.8)<0.001<0.001<0.001
 7 years90712.7(10.6–14.9)12.0(9.9–14.2)16.0(13.6–18.4)<0.001<0.0010.109
 8 years94315.6(13.2–17.9)10.8(8.8–12.8)16.3(13.9–18.6)0.065<0.001<0.001
 9 years97719.2(16.7–21.7)11.2(9.2–13.1)16.2(13.9–18.5)<0.001<0.001<0.001

Prevalence calculated using SPART criteria (BMI ≥ P97).
Prevalence calculated using IOTF reference values (cut-off point corresponding to an adult BMI ≥ 30 kg/m2).
Prevalence calculated with WHO growth standards (BMI ≥ 2 SD).
McNemar test for comparison of prevalence of overweight returned using the SPART and WHO criteria.
McNemar test for comparison of prevalence of overweight returned using IOTF and WHO criteria.
McNemar test for comparison of prevalence of overweight returned using the SPART and IOTF criteria.