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. 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 2:

Original target sample sizes (realized sample sizes)

Component sample AU CA EN US
Smokers/former smokers aged 25+ 1500 (1504) 2350 (2271) 2960 (2886) 1590 (1725)
Smokers/former smokers aged 18–24 750 (735) 1100(887) 500 (514)
Additional (at least) weekly vapers N/A 715 (727) 500 (551) 500 (494)

Note: Realized sample sizes in “Smokers/former smokers” rows include also some long term former smokers in the ITC cohort retained by virtue of vaping at least weekly; the vapers in the final row are all newly recruited in 4CV1.