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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 2.

Figure 2

Association of remote or recent pack years with survival. A, B, C, unadjusted OST, RFT, DST, respectively, for pack years comparing never smokers to 0-20 pack years and >20 pack years for remote use smokers. For remote use, significant differences in OST favored light pack years compared to heavy pack years while RFT and DST were more similar among light and never smokers. D, E, F, unadjusted OST, RFT, DST, respectively, for pack years comparing never smokers to 0-20 pack years and >20 pack years for recent use smokers. For recent use, moderate