Table 2.

Univariable and multivariable linear regression models of the effect of preoperative and postoperative factors on the difference in quality of life 6 months after coronary artery bypass grafting

Univariable analysis				Multivariable analysis
PCS				PCS		R2=0.42
	Beta	95% CI	P value	Beta	95% CI	P value
POCD Z-score at 6 months	0.20	−0.68 to 1.07	0.66	0.18	−0.53 to 0.88	0.62
Age	−0.35	−0.71 to 0.02	0.06	−0.23	−0.52 to 0.07	0.13
Baseline PCS	−0.59	−0.73 to −0.45	<0.001	−0.59	−0.73 to −0.45	<0.001
Baseline cognitive functioning	7.83	−19.8 to 35.1	0.57	6.99	−15.3 to 29.3	0.54
Education level	4.50	0.17 to 8.84	0.04	5.00	1.52 to 8.48	0.05
Delirium	3.72	−12.3 to 19.8	0.65	−4.06	−17.5 to 9.45	0.55

MCS				MCS		R2=0.28
	Beta	95% CI	P value	Beta	95% CI	P value
POCD Z-score at 6 months	0.03	−0.71 to 0.76	0.94	−0.18	−0.85 to 0.50	0.61
Age	−0.10	−0.41 to 0.21	0.52	0.06	−0.23 to 0.34	0.69
Baseline MCS	−0.41	−0.53 to −0.29	<0.001	−0.43	−0.56 to −0.30	<0.001
Baseline cognitive functioning	−0.99	−32.1 to 14.1	0.44	−1.99	−23.4 to 19.4	0.86
Education level	0.16	−3.52 to 3.84	0.93	0.60	−2.69 to 3.89	0.72
Delirium	3.78	−9.78 to 17.3	0.58	−5.00	−18.0 to 7.97	0.45

MCS, Mental Component Score; PCS, Physical Component Score; POCD, postoperative cognitive dysfunction.