Figure 1. Recruitment of Adult Tobacco Users in Ohio, Stratified on Region.
Note.
a: Returned mailings indicating that ≥1 household member was a male, 11–16 years of age.
b: Returned mailings indicating that ≥1 household member used tobacco products.
c: Individuals were not contacted towards the end of recruitment because the anticipated cohort size was reached.
d: Individuals were not contacted after the eligibility screen in order to focus recruitment on SLT, ENDS, and dual users.