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Table 13
Changes, by category, in body mass index (BMI) from 1994/1995 to 2004/2005, by sex, Canada

                                                        Changes, by category, in body mass index (BMI) from 1994/1995 to 2004/2005
Number  %
Increased body mass index  
Both sexes 4,239,384 28.6
Males 2,279,807 29.7
Females 1,959,576 27.5
Same body mass index  
Both sexes 9,577,216 64.7
Males 4,919,719 64.0
Females 4,657,497 65.4
Lower body mass index  
Both sexes 993,503 6.7
Males 484,678 6.3
Females 508,825 7.1
1. The table shows body mass index (BMI) changes of the 1994/1995 household population aged 18 to 56, in cycle 1 and in another cycle of the National Population Health Survey. Population, age and sex are based on the first survey cycle (cycle 1) in 1994/1995.
2. Body mass index (BMI) is calculated by dividing the respondent's body weight (in kilograms) by their height (in metres) squared. The index is: under 18.5 (underweight); 18.5 to 24.9 (normal weight); 25.0 to 29.9 (overweight); 30.0 or higher (obese).
3. The table excludes persons who died or who were institutionalized after cycle 1 survey interview in 1994/1995. Estimated number of persons who have died: 1,279 persons after cycle 5 and 1,640 persons after cycle 6. These data are not all confirmed yet with the Canadian Vital Statistics Database. Persons living in an institution are excluded because they are not asked certain questions. Estimated number of persons who have been institutionalized: 161 persons at cycle 5 and 144 persons at cycle 6.
4. The table also excludes non-response (missing values), that is, "not applicable", "don't know", "refusal" and "not stated".
5. No estimates for body mass index are provided for 1994/1995; what is shown instead are the changes from one body mass index category to another.
6. Percentages are based on the population with a specific characteristic (one category) in a given cycle as the numerator divided by the total population in 1994/1995 having all possible characteristics (all categories) as the denominator, excluding missing values.
7. Bootstrapping techniques were used to produce the coefficient of variation (CV) and 95% confidence intervals (CIs).
8. Data with a coefficient of variation (CV) from 16.6% to 33.3% are identified by an (E) and should be interpreted with caution.
9. Data with a coefficient of variation (CV) greater than 33.3% were suppressed (F) due to extreme sampling variability.
10. Changes in body mass index of the 1994/1995 population in 2004/2005 are based on the 2004/2005 longitudinal full cycle 1 and cycle 6 subset of respondents (from 2004/2005 longitudinal data file). This subset contains all panel members with a complete (full) response in cycle 1 (1994/1995) and cycle 6 (2004/2005), regardless of their response pattern in cycle 2 (1996/1997), cycle 3 (1998/1999), cycle 4 (2000/2001) and cycle 5 (2002-2003). Number of respondents for this table (excluding missing values): 6,382.
Note(s): When comparing estimates, it is important to use confidence intervals to determine if differences between values are statistically significant. Confidence intervals describe sampling variability and give an indication of the precision of a given estimate. Please note that confidence intervals and coefficient of variations are provided in the CANSIM tables.
Source(s): Statistics Canada, National Population Health Survey, 2002/2003 and 2004/2005 longitudinal data file (CANSIM table 104-7030).