表 3.

多因素Cox风险回归分析

Multivariate Cox regression analysis

Variables	Before matching						After matching
	Univariate analysis			Multivariate analysis			Univariate analysis			Multivariate analysis
	HR (95%CI)	P		HR (95%CI)	P		HR (95%CI)	P		HR (95%CI)	P
ASA, American Society of Anesthesiology; HR, hazard ratio; CI, confidence interval. a, indicates per year increase; b, indicates every one indices increase; c, indicates patients with diagnosed diseases; d, indicates per grade increase of ASA physical status, higher grade means increased risk of perioperative death; e, indicates patients who received intraoperative epidural anesthesia and postoperative epidural analgesia; f, indicates per grade increase, pathological grade was divided into undifferentiation, low differentiation, medium differentiation and well differentiation, higher grade means better differentiation; g, indicates per grade increase, tumor size was divided into 5 grades: < 2 cm, 2- < 3 cm, 3- < 5 cm, 5- < 7 cm and ≥7 cm, higher grade means larger tumor size.
Agea	1.04 (1.01, 1.07)	0.005		1.04 (1.02, 1.07)	0.001		1.04 (1.00, 1.08)	0.070		1.04 (1.00, 1.09)	0.046
Body mass indexb	0.88 (0.79, 0.98)	0.015
Coronary artery diseasec	2.25 (1.06, 4.77)	0.035
Diabeticsc	1.86 (0.90, 3.84)	0.095
Chronic renal failurec	4.32 (1.32, 14.10)	0.015		4.27 (1.49, 12.27)	0.007
ASA physical graded	2.28 (1.29, 4.41)	0.004
EGA groupe	0.52 (0.25, 1.11)	0.091		0.53 (0.28, 0.98)	0.044		0.34 (0.12, 0.96)	0.041		0.33 (0.12, 0.91)	0.032
Pathological gradef	0.49 (0.24, 1.03)	0.061		0.42 (0.24, 0.72)	0.002
Tumor sizeg					1.02 (1.00, 1.04)		0.076
Lymph node metastasisc	2.23 (1.11, 4.49)	0.024		2.81 (1.48, 5.34)	0.02		2.44 (0.98, 6.06)	0.056		2.92 (1.16, 7.36)	0.023