Table 2.

Unadjusted scores of health-related quality of life

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
Baseline
Physical functioning	69.87 ± 21.68	72.04 ± 23.36	72.24 ± 21.01	0.601	0.379	0.391	0.941
Role physical	34.33 ± 43.61	40.94 ± 41.15	32.65 ± 40.80	0.189	0.157	0.747	0.101
Bodily pain	61.25 ± 26.11	57.95 ± 27.93	63.38 ± 24.31	0.212	0.261	0.517	0.088
General health	43.33 ± 15.29	52.72 ± 16.50	52.28 ± 15.87	<0.001	<0.001	<0.001	0.820
PCS	52.20 ± 21.10	55.91 ± 21.65	55.14 ± 17.56	0.242	0.103	0.248	0.753
Vitality	62.26 ± 18.23	68.78 ± 19.17	65.91 ± 17.36	0.006	0.002	0.111	0.194
Social functioning	65.18 ± 22.67	70.02 ± 23.94	68.31 ± 20.70	0.157	0.056	0.268	0.531
Role emotional	45.33 ± 44.39	59.73 ± 45.99	45.32 ± 44.37	0.005	0.004	0.998	0.008
Mental health	67.6 ± 16.59	63.89 ± 15.99	67.61 ± 14.10	0.053	0.034	0.994	0.049
MCS	60.09 ± 20.73	65.60 ± 21.52	61.79 ± 19.43	0.050	0.017	0.511	0.126
6 months-baseline
Physical functioning	80.55 ± 15.81	86.92 ± 19.30	88.13 ± 16.46	<0.001	0.001	<0.001	0.559
Role physical	46.34 ± 39.78	63.43 ± 44.65	62.00 ± 42.07	0.001	<0.001	0.003	0.780
Bodily pain	80.12 ± 16.70	85.98 ± 19.51	82.02 ± 19.11	0.015	0.005	0.410	0.076
General health	38.74 ± 18.36	53.88 ± 19.23	54.13 ± 17.34	<0.001	<0.001	<0.001	0.910
PCS	61.44 ± 17.71	72.55 ± 20.36	71.57 ± 18.68	<0.001	<0.001	<0.001	0.669
Vitality	67.97 ± 18.25	77.72 ± 19.28	78.51 ± 18.46	<0.001	<0.001	<0.001	0.727
Social functioning	70.57 ± 21.28	79.79 ± 21.07	81.22 ± 0.98	<0.001	<0.001	<0.001	0.573
Role emotional	54.11 ± 38.37	81.30 ± 45.63	66.91 ± 44.09	<0.001	<0.001	0.017	0.005
Mental health	75.11 ± 16.08	76.55 ± 15.82	76.82 ± 15.97	0.623	0.417	0.389	0.888
MCS	66.69 ± 19.63	78.84 ± 20.88	75.62 ± 21.03	<0.001	<0.001	0.001	0.192
1 year-baseline
Physical functioning	81.43 + 16.95	89.19 ± 19.18	87.11 ± 16.32	<0.001	<0.001	0.010	0.328
Role physical	46.68 ± 39.75	64.67 ± 44.18	59.05 ± 41.39	0.001	<0.001	0.018	0.267
Bodily pain	80.37 ± 18.22	83.26 ± 17.36	83.32 ± 18.73	0.276	0.150	0.189	0.978
General health	41.13 ± 18.88	53.53 ± 19.06	54.87 ± 18.81	<0.001	<0.001	<0.001	0.555
PCS	62.40 ± 19.05	72.66 ± 20.31	71.09 ± 19.12	<0.001	<0.001	<0.001	0.054
Vitality	72.77 ± 20.83	82.72 ± 19.80	79.74 ± 19.63	<0.001	<0.001	0.006	0.218
Social functioning	77.73 ± 22.58	82.67 ± 21.02	83.49 ± 21.61	0.054	0.042	0.034	0.753
Role emotional	58.11 ± 37.48	78.72 ± 45.77	60.27 ± 39.42	<0.001	<0.001	0.675	<0.001
Mental health	78.89 ± 19.25	77.64 ± 16.65	77.84 ± 16.72	0.798	0.521	0.631	0.923
MCS	71.88 ± 21.67	80.44 ± 20.95	75.33 ± 19.51	0.001	<0.001	0.183	0.042

PCS physical component summary, MCS Mental component summary