Effect of local wound infiltration with ropivacaine on postoperative pain relief and stress response reduction after open hepatectomy

Table 1 Demographic characteristics of the patients studied (mean ± SD)

Characteristic	Ropivacaine group	Control group	t/χ2	P value
Age (yr)	48.38 ± 11.74	49.59 ± 12.42	-0.36	0.7176
Gender
Male/female	18/8	18/9	0.04	0.8415
Weight (kg)	63.04 ± 9.21	66.04 ± 9.86	-1.14	0.2583
ASA grade
I/II/III	4/17/5	7/15/5	0.92	0.6298
Incision length (cm)	24.65 ± 1.83	24.22 ± 2.76	0.67	0.5075
Operation type
Left hepatectomy	8	5		0.0086
Right hepatectomy	13	8
Mesohepatectomy	1	0
Caudate lobectomy	2	1
Irregular hepatectomy	2	13
Postoperative pathology
Hepatocellular carcinoma	22	18		0.3292
Intra-and extrahepatic cholangiolithiasis	3	7
Hepatic focal nodular hyperplasia	1	1
Hepatocellular adenoma	0	1

ASA: American Society of Anesthesiologists.