Table 4
Positive and negative predictive values (PPV and NPV) 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
PPV NPV PPV NPV
% 95% confidence interval % 95% confidence interval % 95% confidence interval % 95% confidence interval
from to from to from to from to
Total
Normal weight† 91.7 88.8 94.0 57.7 51.0 64.1 84.9 80.3 88.6 63.8 59.8 67.7
Overweight 53.1 43.4 62.7 90.4 87.0 93.0 40.0 29.8 51.2 83.8 76.3 89.3
Obese 24.0 13.8 38.4 96.9 95.1 98.1 45.8 32.1 60.1 94.5 91.9 96.3
Sex
Boys
Normal weight†
 93.3 88.7 96.1 56.4 48.4 64.1 86.8 79.8 91.6 65.4 58.7 71.5
Overweight
 49.3 37.9 60.8 90.6 85.4 94.1 38.4 26.7 51.6 84.4 76.1 90.1
Obese
 29.0 13.7 51.2 97.3 94.2 98.8 51.9 38.5 65.0 94.6 90.4 97.1
Girls
Normal weight†
 90.3 85.3 93.7 59.7 47.7 70.6 83.3 77.3 88.0 61.3 52.6 69.3
Overweight
 59.4 40.5 75.9 90.2 86.5 92.9 42.2 29.1 56.4 83.3 74.5 89.4
Obese
 16.8 5.8 39.7 96.5 91.9 98.5 32.9 12.4 62.8 94.3 89.9 96.9
Age group (years)
6 to 8
Normal weight†
 93.4 88.6 96.2 49.6 38.2 61.1 88.9 85.3 91.7 57.4 49.6 64.9
Overweight
 47.8 29.5 66.7 89.8 85.6 92.9 34.6 22.7 48.8 88.0 81.2 92.6
Obese
 12.1 5.1 26.2 97.1 94.2 98.6 40.5 22.4 61.7 94.2 91.9 96.0
9 to 11
Normal weight†
 90.6 85.5 94.0 64.3 55.9 72.0 82.0 73.9 88.0 68.8 62.4 74.6
Overweight
 56.2 44.9 66.9 90.9 85.4 94.4 42.9 27.2 60.2 80.4 70.2 87.8
Obese
 41.9 21.4 65.6 96.7 92.8 98.6 51.7 35.2 67.7 94.6 88.4 97.6
† includes underweight
Source: 2007 to 2009 Canadian Health Measures Survey.