Table 5
Self-reported body mass index (BMI) category, by measured BMI category and sex, household population aged 12 years or older, Canada excluding territories, 2005
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| Measured BMI category (range kg/m2) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Underweight (less than 18.5) | Normal weight (18.5 to 24.9) | Overweight (25.0 to 29.9) | Obese class I (30.0 to 34.9) | Obese class II/III (35 or more) | ||||||
| '000 | % | '000 | % | '000 | % | '000 | % | '000 | % | |
| Self-reported BMI category (range kg/m2) | ||||||||||
| Both sexes | 402 | 100 | 10,859 | 100 | 8,746 | 100 | 4,288 | 100 | 1,562 | 100 |
| Underweight (less than 18.5) | 271 | 67 | 308 | 3 | 1 | 0 | 6 | 0 | 0 | 0 |
| Normal weight (18.5 to 24.9) | 131 | 33 | 10,163 | 94 | 2,651 | 30 | 120 | 3 | 4 | 0 |
| Overweight (25.0 to 29.9) | 0 | 0 | 388 | 4 | 5,851 | 67 | 1,894 | 44 | 134 | 9 |
| Obese class I (30.0 to 34.9) | 0 | 0 | 0 | 0 | 244 | 3 | 2,247 | 52 | 603 | 39 |
| Obese class II/III (35.0 or more) | 0 | 0 | 0 | 0 | 0 | 0 | 22 | 1 | 822 | 53 |
| Sensitivity | ||||||||||
| % true positives (95% confidence interval) | 67 (53 to 82) | 94 (92 to 95) | 67 (63 to 71) | 52 (46 to 58) | 53 (44 to 62) | |||||
| Specificity | ||||||||||
| % true negatives (95% confidence interval) | 99 (98 to 99) | 81 (78 to 83) | 86 (84 to 88) | 96 (95 to 97) | 100 (100 to 100) | |||||
| Males | 110 | 100 | 4,620 | 100 | 5,130 | 100 | 2,595 | 100 | 556 | 100 |
| Underweight (less than 18.5) | 44 | 40 | 43 | 1 | 0 | 0 | 6 | 0 | 0 | 0 |
| Normal weight (18.5 to 24.9) | 66 | 60 | 4,374 | 95 | 1,387 | 27 | 37 | 1 | 0 | 0 |
| Overweight (25.0 to 29.9) | 0 | 0 | 203 | 4 | 3,584 | 70 | 1,208 | 47 | 56 | 10 |
| Obese class I (30.0 to 34.9) | 0 | 0 | 0 | 0 | 159 | 3 | 1,325 | 51 | 248 | 45 |
| Obese class II/III (35.0 or more) | 0 | 0 | 0 | 0 | 0 | 0 | 20 | 1 | 252 | 45 |
| Sensitivity | ||||||||||
| % true positives (95% confidence interval) | 40 (8 to 71) | 95 (93 to 97) | 70 (65 to 75) | 51 (43 to 59) | 45 (32 to 59) | |||||
| Specificity | ||||||||||
| % true negatives (95% confidence interval) | 100 (99 to 100) | 82 (79 to 85) | 81(78 to 84) | 96 (95 to 98) | 100 (100 to 100) | |||||
| Females | 293 | 100 | 6,238 | 100 | 3,617 | 100 | 1,693 | 100 | 1,006 | 100 |
| Underweight (less than 18.5) | 227 | 78 | 265 | 4 | 1 | 0 | 0 | 0 | 0 | 0 |
| Normal weight (18.5 to 24.9) | 65 | 22 | 5,789 | 93 | 1,265 | 35 | 83 | 5 | 4 | 0 |
| Overweight (25.0 to 29.9) | 0 | 0 | 185 | 3 | 2,267 | 63 | 686 | 41 | 78 | 8 |
| Obese class I (30.0 to 34.9) | 0 | 0 | 0 | 0 | 85 | 2 | 922 | 54 | 355 | 35 |
| Obese class II/III (35 or more) | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 570 | 57 |
| Sensitivity | ||||||||||
| % true positives (95% confidence interval) | 78 (63 to 92) | 93 (90 to 95) | 63 (57 to 68) | 54 (46 to 63) | 57 (45 to 68) | |||||
| Specificity | ||||||||||
| % true negatives (95% confidence interval) | 98 (97 to 99) | 79 (75 to 82) | 90 (88 to 92) | 96 (95 to 97) | 100 (100 to 100) | |||||
| Source: Statistics Canada, 2005 Canadian Community Health Survey (subsample 2). | ||||||||||
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