Table 3.

Association of former smokers who quit over 15 years ago (n=1297), overall and by quartiles of pack-years (PY) of smoking and current smokers (n=629) with all-cause mortality, compared to never-smokers (n=2556)

All-Cause Mortality	Events (%)	Hazard ratio (95% confidence interval); P-value
		Unadjusted	Age-sex-race-adjusted	Multivariable-adjusted*
Never–smokers (n=2556)	1007 (39)	1.00 (Reference)	1.00 (Reference)	1.00 (Reference)
Former smokers, overall, (n=1297)	568 (44)	1.13 (1.02–1.26); P=0.017	1.08 (0.96–1.20); P=0.193	1.12 (1.01–1.25); P=0.039
<8 PY (n=383)	139 (36)	0.88 (0.74–1.05); P=0.163	0.93 (0.77–1.11); P=0.402	1.04 (0.87–1.25); P=0.649
8–15 PY (n=250)	104 (42)	1.06 (0.87–1.30); P=0.570	1.00 (0.81–1.22); P=0.980	1.06 (0.87–1.31); P=0.560
16–31 PY (n=352)	150 (43)	1.09 (0.92–1.29); P=0.346	1.04 (0.87–1.24); P=0.650	1.12 (0.94–1.34); P=0.208
≥32 PY (n=312)	175 (56)	1.63 (1.39–1.91); P<0.001	1.38 (1.17–1.64); P<0.001	1.26 (1.06–1.49); P=0.008
Current smokers (n=629)	335 (53)	1.56 (1.38–1.77); P<0.001	2.17 (1.91–2.47); P<0.001	2.04 (1.78–2.34); P<0.001

^*Adjusted for the same covariates as in Table 2