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Table 2. Percentage distribution of body mass index (BMI), by sex, household population aged 18 or older, Canada excluding territories, 1978/79 and 2004
  Both sexes Men Women
1978/79
%
2004
%
1978/79
%
2004
%
1978/79
%
2004
%
Underweight
2.4
2.0
1.42
1.42
3.5
2.5
Normal weight
48.4
38.91
44.3
33.61
52.5
44.11
Overweight (not obese)
35.4
36.1
42.8
42.0
28.4
30.2
Obese Class I
10.5
15.21
9.5
16.51
11.3
14.01
Obese Class II
2.32
5.11
3
4.81
2.9
5.51
Obese Class III
0.92
2.71
3
1.61
1.52
3.81
Overweight and obese (BMI ≥ 25)
49.2
59.11
54.4
65.01
44.0
53.41
Obese (BMI ≥ 30)
13.8
23.11
11.5
22.91
15.7
23.21
Average BMI
25.4
27.01
25.7
27.21
25.2
26.71
Note: The 1978/79 Canada Health Survey estimates were age-standardized to the 2004 CCHS population.
1. Significantly different from estimate for 1978/79 (p < 0.05)
2. Coefficient of variation between 16.6% and 33.3% (interpret with caution)
3. Coefficient of variation greater than 33.3% (suppressed because of extreme sampling variability)
Data sources: 2004 Canadian Community Health Survey: Nutrition; 1978/79 Canada Health Survey