Students completed the written questionnaire themselves. All persons aged 15-19 in the LFS households were interviewed. The total sample for the Youth Smoking Survey consisted of approximately 23,700 interviews. The different data collection methods should also be taken into consideration when comparing the two age groups. The reliability of estimates depends on the size of the sample and subsamples, not the size of the population.
Smaller samples are less reliable than larger samples.
Thus data for a province are less reliable than for Canada as a whole, and data for a subgroup in a small province may not be publishable. Microdata A public use microdata set containing the results of the survey is available for purchase from Statistics Canada. The Daily and later by Health Canada, for National Non-Smoking Week.