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. 2021 Jun 2;22:100794. doi: 10.1016/j.conctc.2021.100794

Table 1.

Distribution of subjects by product use into 7 study groups.

User Groups Study Group
Study Group 1 (Nov 1–4 2019) Study Group 2 (Nov 7–10 2019) Study Group 3 (Nov 15–18 2019) Study Group 4 (Dec 13–16 2019) Study Group 5 (Jan 13–16 2020) Study Group 6 (Feb 21–24 2020) Study Group 7 (May 26–29 2020)
Non-Users 10 NU
Smokers of Cigarettes 10 CC
Users of E-Cigarettes 10 EC
Users of Heated Tobacco Products 4 HTP 6 HTP
Users of Nicotine Replacement Therapy 3 NRT 3 NRT 1 NRT 3 NRT
Users of Oral Tobacco 2OT 3 OT 4 OT 1 OT