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Measured adult body mass index (BMI), by age group and sex, household population aged 18 and over excluding pregnant females, Canada


                            Measured adult body mass index
  Total Underweight, BMI under 18.50 Normal weight, BMI 18.50 to 24.99 Overweight, BMI 25.00 to 29.99 Obese, BMI 30.00 or higher
  number number % number % number % number %
2004  
Total, 18 years and over 23,985,069 471,315 2.0 9,328,312 38.9 8,646,771 36.1 5,538,672 23.1
Males 11,860,932 169,614 E 1.4 E 3,985,661 33.6 4,983,865 42.0 2,721,792 22.9
Females 12,124,137 301,700 2.5 5,342,651 44.1 3,662,906 30.2 2,816,880 23.2
18 to 34 years 6,970,240 235,995 E 3.4 E 3,549,321 50.9 2,041,033 29.3 1,143,890 16.4
Males 3,581,115 71,767 E 2.0 E 1,656,601 46.3 1,212,189 33.8 640,558 17.9
Females 3,389,125 164,228 E 4.8 E 1,892,721 55.8 828,844 24.5 503,332 14.9
18 to 24 years 3,144,054 139,984 E 4.5 E 1,866,568 59.4 779,849 24.8 357,654 11.4
Males 1,680,982 59,262 E 3.5 E 987,782 58.8 453,255 27.0 180,683 E 10.7 E
Females 1,463,072 80,722 E 5.5 E 878,786 60.1 326,594 22.3 176,971 12.1
18 to 19 years 884,912 58,109 E 6.6 E 556,486 62.9 167,903 19.0 102,414 11.6
Males 441,991 27,610 E 6.2 E 292,188 66.1 76,743 E 17.4 E 45,450 E 10.3 E
Females 442,921 F F 264,298 59.7 91,160 E 20.6 E 56,965 E 12.9 E
20 to 24 years 2,259,142 81,875 E 3.6 E 1,310,082 58.0 611,946 27.1 255,239 11.3
Males 1,238,991 F F 695,594 56.1 376,512 30.4 135,233 E 10.9 E
Females 1,020,151 F F 614,488 60.2 235,434 23.1 120,006 E 11.8 E
25 to 34 years 3,826,185 F F 1,682,754 44.0 1,261,184 33.0 786,236 20.5
Males 1,900,133 F F 668,818 35.2 758,935 39.9 459,875 24.2
Females 1,926,052 F F 1,013,935 52.6 502,250 26.1 326,362 16.9
35 to 44 years 5,105,776 111,999 E 2.2 E 2,104,693 41.2 1,846,153 36.2 1,042,930 20.4
Males 2,576,531 F F 847,972 32.9 1,147,123 44.5 514,221 20.0
Females 2,529,245 F F 1,256,721 49.7 699,030 27.6 528,709 20.9
45 to 64 years 8,138,670 51,424 E 0.6 E 2,523,586 31.0 3,122,115 38.4 2,441,545 30.0
Males 3,992,986 F F 1,045,610 26.2 1,749,085 43.8 1,188,123 29.8
Females 4,145,684 41,255 E 1.0 E 1,477,976 35.7 1,373,030 33.1 1,253,423 30.2
45 to 54 years 4,797,883 27,745 E 0.6 E 1,517,945 31.6 1,825,570 38.0 1,426,623 29.7
Males 2,369,969 F F 654,011 27.6 1,004,800 42.4 707,801 29.9
Females 2,427,914 F F 863,934 35.6 820,770 33.8 718,821 29.6
55 to 64 years 3,340,787 23,679 E 0.7 E 1,005,641 30.1 1,296,545 38.8 1,014,923 30.4
Males 1,623,017 F F 391,599 24.1 744,285 45.9 480,321 29.6
Females 1,717,770 F F 614,042 35.7 552,259 32.1 534,602 31.1
65 years and over 3,770,384 71,896 E 1.9 E 1,150,712 30.5 1,637,470 43.4 910,306 24.1
Males 1,710,301 20,463 E 1.2 E 435,478 25.5 875,468 51.2 378,891 22.2
Females 2,060,084 51,433 E 2.5 E 715,233 34.7 762,002 37.0 531,415 25.8
65 to 74 years 2,053,107 F F 583,435 28.4 929,422 45.3 504,748 24.6
Males 1,025,386 F F 226,721 22.1 540,005 52.7 246,483 24.0
Females 1,027,720 F F 356,713 34.7 389,417 37.9 258,264 25.1
75 years and over 1,717,278 36,394 E 2.1 E 567,277 33.0 708,048 41.2 405,558 23.6
Males 684,914 F F 208,757 30.5 335,463 49.0 132,407 19.3
Females 1,032,363 28,107 E 2.7 E 358,520 34.7 372,585 36.1 273,151 26.5

1. Data source: Statistics Canada, Canadian Community Health Survey, Nutrition, 2004
2. A definition change was implemented in 2004 to conform with Health Canada guidelines for body weight classification.
3. Measured body mass index (BMI) is calculated by dividing the respondent's measured body weight (in kilograms) by their measured height (in metres) squared.
4. The index is: less than 18.50 (underweight); 18.50 to 24.99 (normal weight), 25.00 to 29.99 (overweight); 30.00 to 34.99 (obese, class I); 35.00 to 39.99 (obese, class II); 40.00 or greater (obese, class III).
5. Body mass index (BMI) is a method of classifying body weight according to health risk. According to the World Health Organization (WHO) and Health Canada guidelines, health risk levels are associated with each of the following BMI categories: normal weight = least health risk; underweight and overweight = increased health risk; obese, class I = high health risk; obese, class II = very high health risk; obese, class III = extremely high health risk.
6. Bootstrapping techniques were used to produce the coefficient of variation (CV) and 95% confidence intervals (CIs).
7. Data with a coefficient of variation (CV) from 16.6% to 33.3% are identified by an (E) and should be interpreted with caution.
8. Data with a coefficient of variation (CV) greater than 33.3% were suppressed (F) due to extreme sampling variability.
9. CANSIM table 105-2001.