. Author manuscript; available in PMC: 2019 Oct 21.

Published in final edited form as: Addiction. 2019 Jan 24;114(Suppl 1):6–14. doi: 10.1111/add.14528

Table 3:

Types of Quotas Applied to Sample Composition

Sample component	Quota cells
AU smokers/former smokers age 18+	Geographic regions crossed with sex (realized approximately)
CA, US smokers/former smokers age 18–24	Geographic regions; language in Canada
CA smokers/former smokers age 25+	Geographic regions; language
US smokers/former smokers age 25+	None; most of the sample was from the 4C cohort, expanded in 4C Wave 9
CA, US, EN additional vapers age 18+	Geographic regions
EN smokers/former smokers age 18–24	Geographic regions crossed with sex
EN smokers/former smokers age 25+	Geographic regions crossed with sex and age group