Table 3. Independent predictors of quality of life improvement after 2 years of coronary artery bypass surgery.

Section	Variablea	(Univariate)	(Multivariate analysis)
		p value	Coefficient	p value	OR	95% CI
Physical mobility	Gender	0.06	0.84	0.11	2.33	0.82–6.58
	Age	0.1	0.02	0.40	0.97	0.26–1.07
	Class of angina (CCS)	0.001	0.56	0.003b	1.76	1.21–2.55
Social isolation	Gender	0.04	0.38	0.36	1.46	0.65–3.25
	Age	0.02	0.02	0.41	1.02	0.97–1.07
	Marital status	0.04	−0.67	0.20	0.51	0.18–1.44
	Hypertension	0.02	0.56	0.13	1.76	0.84–3.67
	Smoking	0.07	−0.19	0.43	0.82	0.51–1.33
	Physical inactivity	0.16	0.30	0.37	1.36	0.81–3.68
	Class of angina (CCS)	0.01	0.36	0.057	1.43	0.99–2.08
Emotional reaction	Hypertension	0.07	0.60	0.07	1.82	0.94–3.55
	Hypercholesterolemia	0.17	0.47	0.14	1.60	0.86–2.99
	Heredity	0.17	−0.47	0.14	0.63	0.33–1.17
	Stress	0.05	0.66	0.06	1.95	0.95–4.00
	Prior myocardial infarction	0.09	0.40	0.11	1.49	0.91–2.44
Energy	Gender	0.15	0.59	0.15	1.25	0.81–4.05
	Age	0.009	0.02	0.36	1.02	0.97–1.08
	Hypertension	0.18	0.17	0.64	1.19	0.58–2.45
	Smoking	0.04	−0.23	0.36	0.80	0.49–1.29
	Diabetes mellitus	0.16	−0.78	0.09	0.46	0.18–1.14
	Heredity	0.002	−1.05	0.002b	0.35	0.18–0.68
	Class of angina (CCS)	0.001	0.49	0.01b	1.63	1.11–2.38
	EuroSCORE	0.17	0.05	0.58	1.05	0.88–1.24
Sleep	Gender	0.05	−0.85	0.03b	0.43	0.20–0.93
	Smoking	0.12	−0.40	0.06	0.67	0.44–1.02
	Diabetes mellitus	0.08	−0.31	0.52	0.73	0.29–1.87
	Class of angina (CCS)	0.01	0.50	0.005b	1.65	1.16–2.35
	Comorbidity	0.04	−0.52	0.16	0.59	0.28–1.23
Pain	Diabetes mellitus	0.01	−0.90	0.006b	0.27	0.10–0.68
	Duration of CAD	0.05	−0.46	0.07	0.91	0.83–1.01
	Prior myocardial infarction	0.04	0.78	0.054	0.50	0.24–1.01
	Class of angina (CCS)	<0.001	0.34	<0.001b	2.43	1.57–3.77
	Ejection fraction	0.16	0.40	0.88	1.00	0.96–1.05
	EuroSCORE	0.16	1.38	0.86	0.98	0.78–1.23

^aVariable selected from univariate analysis (p ≤0.20). ^bStatistically significant in multivariate analysis. CCS: canadian cardiovascular society classification of angina; CAD: coronary artery disease; EuroSCORE: European system for cardiac operative risk evaluation; CI: confidence interval; OR: odds ratio