Table 5
Sensitivity and specificity values for self-reported and corrected data, by sex, household population aged 18 to 79, Canada, 2008

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  Self-reported Corrected
Based on 2007 to 2009 Canadian Health Measures Survey Based on 2005 Canadian Community Health Survey
% 95% confidence interval % 95% confidence interval % 95% confidence interval
from to from to from to
Sensitivity (% true positives)
Men
Underweight 58.7 29.0 83.1 58.7 29.0 83.1 58.7 29.0 83.1
Normal weight 90.6 85.5 94.0 84.9* 79.7 89.0 83.5* 77.9 87.8
Overweight 69.7 65.2 73.8 80.0* 75.8 83.7 78.4* 73.8 82.4
Obese 67.4 61.1 73.1 77.4* 71.8 82.1 83.7* 78.8 87.6
Women
Underweight 73.0 58.0 84.2 55.2* 38.3 71.1 26.4* 14.6 43.0
Normal weight 93.6 90.8 95.6 89.8* 86.2 92.5 85.4* 81.4 88.7
Overweight 68.4 63.4 73.1 79.0* 74.5 83.0 77.6* 73.1 81.6
Obese 65.2 58.4 71.5 75.4* 69.1 80.8 81.5* 74.9 86.6
Specificity (% true negatives)
Men
Underweight 99.7 99.2 99.9 99.8 99.3 99.9 99.8 99.3 99.9
Normal weight 81.6 78.6 84.3 89.4* 86.8 91.5 90.2* 87.6 92.3
Overweight 81.5 77.6 84.8 82.6 79.0 85.7 84.7* 81.2 87.6
Obese 98.8 97.5 99.4 97.5* 96.0 98.5 95.8* 93.9 97.2
Women
Underweight 97.8 96.6 98.6 98.5* 97.2 99.2 98.8* 97.5 99.4
Normal weight 81.6 78.7 84.3 89.0* 86.5 91.1 90.3* 87.9 92.3
Overweight 88.4 85.4 90.9 88.0 85.0 90.5 87.0 83.9 89.5
Obese 98.8 98.0 99.3 97.6* 96.0 98.5 95.0* 93.3 96.3
* significantly different from self-reported estimate (p < 0.05)
Source: 2008 Canadian Community Health Survey (subsample).