| 1. |
Body mass index (BMI) is calculated by dividing
the respondent's body weight (in kilograms) by their height (in metres) squared.
|
| 2. |
The index is: neither overweight nor obese;
overweight; obese. |
| 3. |
Body mass index (BMI) for youth is different
from that of adults as they are still maturing. This variable classifies the
measured BMI of children aged 12 to 17 as "obese" or "overweight"
according to the age- and sex-specific BMI cut-off points as defined by Cole
and others. The Cole cut-off points are based on pooled international data
(Brazil, Great Britain, Hong Kong, Netherlands, Singapore and United States)
for BMI and linked to the internationally accepted adult BMI cut-off points
of 25 (overweight) and 30 (obese). Respondents who do
not fall within the categories of "obese" or "overweight" (as defined by Cole
and others) have been classified by the Canadian Community Health Survey (CCHS)
as "neither overweight nor obese". |
| 4. |
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. |
| 5. |
Bootstrapping techniques were used to produce
the coefficient of variation (CV) and 95% confidence intervals (CIs).
|
| 6. |
Data with a coefficient of variation (CV) from 16.6%
to 33.3% are identified as follows: (E) use with caution. |
| 7. |
Data with a coefficient of variation (CV) greater
than 33.3% were suppressed due to extreme sampling variability and are
identified as follows: (F) too unreliable to be published. |
| Source: |
Statistics Canada, Canadian Community Health Survey (CCHS 3.1), 2005 (CANSIM
table 105-0408). |
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