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. Author manuscript; available in PMC: 2017 Dec 1.
Published in final edited form as: Head Neck. 2016 Jul 19;38(12):1810–1820. doi: 10.1002/hed.24515

Figure 1.

Figure 1

Survival benefits according to smoking status (A-C), pack years (D-F), and years since quit (G-I). Panels A, B, C: unadjusted OST, RFT, and DST, respectively, by cigarette use (never, former, current). Never smokers showed significantly better survival outcomes than smokers in univariable Cox models. Interestingly, there were no significant survival differences between former and current smokers. Panels D, E, F: unadjusted OST, RFT, and DST, respectively, by pack years (never smoker, smokers 0-20 pack years, and smokers > 20 pack years). Never smokers had significantly better survival outcomes than smokers (OST p-value=0.01 in univariable Cox model). There were apparent differences in each category of survival events with a 7-10% increase risk of outcome for every 10 pack year increase in cigarette use (Cox Proportional models for OST, RFT, DST; p=0.01, 0.007, 0.005, respectively). Panels G, H, I: unadjusted OST, RFT, and DST, respectively, by years since quitting (never smoker, smoker quit 10+ years ago, smoker quit 0-10 years ago). When grouped by year since quitting, there were no significant differences comparing remote and quitters.