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. Author manuscript; available in PMC: 2017 Sep 21.
Published in final edited form as: Ann Intern Med. 2017 Feb 7;166(6):390–400. doi: 10.7326/M16-1107

Figure 2. Urinary metabolite levels^ for selected toxicants by group*: (A) Tobacco- specific N-nitrosamine (NNK), (B) Acrolein, (C) Acrylamide, (D) Acrylonitrile, (E) 1,3-butadiene, (F) Ethylene oxide.

Figure 2

^Data are raw values divided by ratio of observed to covariate-adjusted creatinine levels; values below the limit of detection (LOD) were imputed by LOD divided by square root of 2; *Boxplots show median with interquartile range (25%-75%); error bars show Tukey’s whiskers and cross indicates arithmetic mean (geometric means are provided in Table S1); Solid grey circles show outliers; Significant pairwise comparisons are presented in Table S1; NRT – Nicotine replacement therapy; EC – Electronic cigarette; Cig-Cigarette