Table 3.

Adjusted changes in Health-Related Quality of Life according to smoking status

SF-36 Subscale	Persisitent smokers (N = 172)	Never smokers (N = 351)	Quitters (N = 126)	P Value
				3 Groups	Persistent vs Never	Persistent vs Quitter	Never vs Quitter
6 months-baseline
Physical functioning	10.72 ± 15.62	15.62 ± 17.71	16.29 ± 16.74	0.003	0.002	0.005	0.703
Role physical	13.35 ± 50.05	24.66 ± 47.76	26.44 ± 43.18	0.020	0.011	0.019	0.719
Bodily pain	18.78 ± 24.92	24.19 ± 28.63	19.15 ± 27.60	0.053	0.035	0.910	0.078
General health	−4.86 ± 17.58	0.70 ± 14.57	2.49 ± 15.17	<0.001	<0.001	<0.001	0.268
PCS	9.50 ± 20.48	16.29 ± 19.91	16.09 ± 18.03	0.001	<0.001	0.004	0.922
Vitality	5.33 ± 16.09	9.68 ± 16.06	12.24 ± 14.92	0.001	0.003	<0.001	0.121
Social functioning	5.81 ± 21.19	10.92 ± 20.64	12.25 ± 24.70	0.015	0.011	0.554	0.554
Role emotional	8.31 ± 52.53	20.29 ± 50.33	19.72 ± 48.02	0.031	0.011	0.054	0.914
Mental health	7.28 ± 12.06	11.72 ± 15.34	9.72 ± 13.34	0.003	0.001	0.142	0.175
MCS	6.43 ± 20.00	13.15 ± 19.41	13.23 ± 17.94	<0.001	<0.001	0.003	0.968
1 year-baseline
Physical functioning	11.87 ± 15.87	17.46 ± 18.25	15.84 ± 17.37	0.003	0.001	0.053	0.183
Role physical	14.99 ± 50.07	27.38 ± 42.64	24.35 ± 43.83	0.013	0.003	0.076	0.517
Bodily pain	19.60 ± 27.07	22.54 ± 26.55	20.23 ± 25.66	0.433	0.235	0.840	0.402
General health	−2.34 ± 17.09	0.81 ± 15.94	2.97 ± 16.26	0.017	0.039	0.006	0.203
PCS	11.03 ± 20.51	17.05 ± 18.20	15.85 ± 18.38	0.003	0.001	0.030	0.539
Vitality	10.14 ± 16.91	14.72 ± 16.51	13.31 ± 16.97	0.013	0.003	0.106	0.414
Social functioning	12.87 ± 21.62	14.30 ± 20.03	14.29 ± 25.53	0.760	0.477	0.577	0.994
Role emotional	11.86 ± 49.76	22.84 ± 50.93	12.98 ± 43.56	0.026	0.017	0.846	0.054
Mental health	10.79 ± 14.19	13.59 ± 16.15	10.49 ± 14.32	0.053	0.050	0.868	0.052
MCS	11.41 ± 20.88	16.36 ± 18.66	12.76 ± 17.77	0.013	0.006	0.546	0.070

PCS physical component summary, MCS Mental component summary