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Estimates

The data presented in this report are weighted estimates, unless otherwise noted. The CTUMS/CTADS survey weights assigned by Statistics Canada in the annual datasets were used for CTUMS/CTADS analyses, and YSS survey weights were used for YSS analyses; CTUMS/CTADS and YSS were not analysed together and there was no overlap of the survey weights between the two surveys. Estimates for categorical measures were generated using the SURVEYFREQ procedure in SAS statistical software (Version 9.4), while estimates for continuous variables (e.g., cigarettes per day) were generated using the SURVEYMEANS procedure in SAS. Confidence intervals were generated using the statistical software Stata (Version 14.2) using the bootstrap weights where they were available (CTADS 2013, CTUMS 2001 to 2012, CSTADS 2014-15, and YSS 2004-05 to 2012-13).

Reporting

Confidence intervals are available in data tables posted on the website; caution should be used when making comparisons without first checking the confidence intervals. Estimates are not reported where specific categories included less than 30 individuals (unweighted), except where noted as not meeting Statistics Canada’s quality standards. In addition to this rule, Health Canada also recommends calculating the coefficient of variation to determine the quality level of the estimate (for further information, please refer to the documentation for specific surveys and waves/years). As a result, some estimates included in this report may be reported “with caution” or not reported by Health Canada in their releases. In some cases for CSTADS estimates, to facilitate interpretation of these suppressed estimates based on less than 30 individuals, an upper bound of the estimate was calculated. The upper bound is the percentage that would occur if 30 individuals were in the numerator rather than the number less than 30. Similarly, for estimates with coefficients of variation in excess of 33.3%, an upper bound of the estimate was calculated. The upper bound, in this case, is the percentage estimate that would be needed to achieve a coefficient of variation of 33.3%. When either of these upper bounds are <2%, they have been reported as such.


Rounding

Estimates in figures and the associated data tables have been rounded to one decimal place. Provincial estimates for numbers of smokers reported in sections 2.1-2.10 have been rounded to the nearest thousand.