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. Author manuscript; available in PMC: 2017 Sep 1.
Published in final edited form as: Pharmacol Biochem Behav. 2016 May 11;148:1–7. doi: 10.1016/j.pbb.2016.05.002

Figure 2.

Figure 2

Relationship between NMR quartile and tobacco use characteristics in African Americans and Whites. Shown are the means ± SEM for (A) CPD, (B) expired CO, and (C) expired CO per cigarette. Data are combined for men and women as sex did not significantly influence the results. No significant interactions by NMR quartile. Because there were no interactions, main effects of race (###)= p<0.001, (##)= p<0. 01) and NMR quartile ($)= p<0.05) are presented in the figure.