Non-small cell lung cancer in ever-smokers vs never-smokers

Table 7 Median survival times for 10-year overall survival

Source	Never-smokers median survival time^a [n = 67]	Ever-smokers median survival time [n = 88]	Difference
Kaplan–Meier estimates	6.9 years 95% CI (5.4, 9.5)	4.4 years 95% CI (2.6, 6.2)	2.5 years
Parametric survival time regression	6.6 years 95% CI (4.2, 9.0)	3.9 years 95% CI (2.7, 5.0)	2.7 years 95% CI (0.1, 5.4) p = 0.045

^aThe median survival time is the follow-up time (X axis) value corresponding to the 0.50 or 50% survival probability (Y axis) on the Kaplan–Meier curve. It is the predicted median time to death event from the parametric survival time regression models that assumes an exponential survival distribution

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