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. 2019 Dec 23;21(Suppl 1):S49–S55. doi: 10.1093/ntr/ntz134

Figure 2.

Figure 2.

Upper panel: mean proportion of choices allocated to all possible 2-dose comparisons across the four nicotine dose cigarettes (0.4, 2.4, 5.2, 15.8 mg/g tobacco) across Phase 2 choice sessions within each age group (18–24 vs. ≥ 25 years old). Lower panel: mean proportion of choices across Phase 3 sessions within each age group (18–24 vs. ≥ 25 years old). Data points represent mean proportion of choices allocated to the different nicotine dose cigarettes. Error bars represent ± SEM. No significant differences observed by age were noted. Analyses included session order, project, CPD, and FTND as covariates. FTND = Fagerström Test for Nicotine Dependence.