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. 2022 Mar 11;3:100067. doi: 10.1016/j.crtox.2022.100067

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© 2022 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 3 — Linear regressions between estimated nicotine intake and urinary excretion of Nequ (Nic + 10) for individual smokers (A), vapers (B) and users of HTP (C), NRT (D) and OT (E) on Day 3. Note that for vapers the intake was calculated with the daily average of consumed e-liquid from Day 1 to 3. CI is the 95 % confidence interval for the slope. R² (square of the Pearson coefficient of correlation) is used as an indicator for the goodness of fit.