Table 2.

Comparisons of operative and postoperative variables between the two groups before and after propensity score matching.

Variables	Before matching		P value	After matching		P value
	Ertapenem	Non-ertapenem		Ertapenem	Non-ertapenem
	(n=78)	(n=197 )		(n=65)	(n=65 )
Tumor number, solitary/ multiple	71/7	163/34	0.082	59/6	55/10	0.286
Mean tumor size (mm)	40.32 ± 21.02	52.63 ± 45.80	0.023∗	41.66 ± 22.14	42.12 ± 21.08	0.903
Major hepatectomy, yes/no	18/60	41/156	0.68	16/49	17/48	0.84
Anatomical resection, yes/no	52/26	130/67	0.915	44/21	45/20	0.85
Cholecystectomy, yes/no	36/42	80/117	0.401	27/38	28/37	0.859
Mean operative time (min)	197.81 ± 71.69	195.02 ± 108.60	0.834	191.80 ± 66.68	191.72 ± 65.76	0.995
Mean blood loss (mL)	407.95 ± 348.58	657.87 ± 1293.94	0.094	421.54 ± 366.39	428.31 ± 513.44	0.931
Blood transfusion, yes/no	21/57	66/131	0.29	18/47	21/44	0.566
Hepatic inflow occlusion, yes/no	54/24	115/82	0.095	44/21	46/19	0.704
Postoperative hemorrhage, yes/no	1/77	4/193	0.675	1/64	0/65	0.315
Bile leakage, yes/no	5/73	12/185	0.921	5/60	7/58	0.545
Liver failure, yes/no	0/78	2/195	0.372	0/65	0/65	-
Ascites, yes/no	12/66	48/149	0.104	12/53	10/55	0.64
Pleural effusion, yes/no	11/67	34/163	0.524	10/55	11/54	0.812
Removal of abdominal drains (day)	9.13 ± 3.38	11.61 ± 8.36	0.012∗	9.32 ± 3.56	10.05 ± 5.40	0.369