Table 3
Sensitivity and specificity values for parent-reported body mass index categories, by sex and age group, household population aged 6 to 11, Canada, 2007 to 2009

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  International Obesity Task Force BMI cut-points World Health Organization BMI cut-points
Sensitivity Specificity Sensitivity Specificity
% 95% confidence interval % 95% confidence interval % 95% confidence interval % 95% confidence interval
from to from to from to from to
Total
Normal weight 83.0 77.7 87.3 75.6 67.0 82.5 78.4 72.5 83.4 73.2 66.7 78.8
Overweight 56.5 42.0 70.0 89.2 84.7 92.5 38.3 26.9 51.2 84.8 80.5 88.2
Obese 50.6 40.4 60.7 90.6 85.2 94.1 66.2 55.0 75.8 88.0 82.0 92.2
Sex
Boys
Normal weight
79.1 70.1 85.9 82.7 70.1 90.7 74.1 63.5 82.5 81.3 70.1 89.0
Overweight
60.8 45.2 74.4 85.9 79.4 90.5 40.4 26.5 56.1 83.2 77.2 87.8
Obese
62.6 38.5 81.7 89.8 81.4 94.7 76.3 56.7 88.8 85.5 76.7 91.3
Girls
Normal weight
87.1 84.2 89.6 67.0 50.1 80.4 82.6 79.1 85.6 62.5 51.0 72.8
Overweight
51.6 34.5 68.3 92.6 88.7 95.3 36.2 21.9 53.4 86.5 83.1 89.3
Obese
34.1 16.8 56.9 91.4 87.8 94.0 46.0 21.9 72.1 90.5 86.6 93.4
Age group (years)
6 to 8
Normal weight
79.4 72.8 84.7 78.2 63.3 88.2 75.7 65.9 83.4 77.6 70.9 83.1
Overweight
47.3 23.8 72.0 90.0 85.1 93.4 36.0 23.5 50.7 87.4 82.1 91.3
Obese
45.4 23.9 68.9 84.9 76.3 90.8 68.8 50.4 82.7 83.5 75.7 89.2
9 to 11
Normal weight
85.9 80.5 90.1 73.9 64.6 81.5 80.7 74.4 85.8 70.6 61.6 78.3
Overweight
62.3 48.1 74.7 88.5 82.7 92.6 39.4 23.8 57.6 82.6 76.3 87.5
Obese
53.2 39.4 66.6 94.9 91.5 97.0 64.0 49.0 76.7 91.3 86.0 94.8
includes underweight
Source: 2007 to 2009 Canadian Health Measures Survey.