Table 1.

Summary of characteristics of included studies.

Study	Location/year	Surgical	Number of		Number of		Childs-Pugh		Tumor size		Tumor number
		approach	patients		nodules		(A: B: C)		(cm)		(solitary: multiple)
			PRFA	SRFA	PRFA	SRFA	PRFA	SRFA	PRFA	SRFA	PRFA	SRFA
Eun, H. S	Korea/2017	laparoscopic	33	33	36	40	NR	NR	1.7	1.7	31:2	27:6
Chen, S	China/2018	laparoscopic	30	30	32	46	NR	NR	NR	NR	NR	NR
Khan, M. R (1)	China/2007	laparoscopic + open	92	63	110	81	87:5:0	54:8:1	1.9 ± 0.6	2.2 ± 0.6	75:17	51:12
Khan, M. R (2)	China/2007	laparoscopic + open	25	48	27	63	22:3:0	45:2:1	3.6 ± 0.4	3.9 ± 0.5	23:2	37:11
Li, J	China/2018	open	54	35	71	48	49:4:0	34:2:0	2.8 (0.8–6.0)	3.5 (0.4–5.0)	NR	NR
Hirooka, M	Japan/2009	laparoscopic	37	37	44	42	29:8:0	25:12:0	2.49 ± 0.46	2.6 ± 0.69	NR	NR
Sherif, Z	Egypt/2008	laparoscopic	30	30	36	34	6:24:0	10:20:0	NR	NR	22:8	10:20
Zhang, W (1)	China/2016	laparoscopic	77	19	175	42	74:3:0	18:1:0	2.3 ± 0.6	2.3 ± 0.6	NR	NR
Zhang, W (2)	China/2016	open	77	58	175	137	74:3:0	57:1:0	2.3 ± 0.6	2.3 ± 0.5	NR	NR
Curley, S. A	Italy/2000	laparoscopic + open	76	34	84	65	17:30:29	33:1:0	2.8 ± 0.8	4.6 ± 1.7	NR	NR
Raut, C. P	American/2005	open	140	32	190	NR	59:46:35	NR	3	NR	101:39	NR
Huang, J. W	China/2011	open	69	93	89	108	61:8:0	93:0:0	1.7 ± 1.1	1.8 ± 1.0	51:18	79:14

PRFA, percutaneous radiofrequency ablation; SRFA, surgical radiofrequency ablation; NR, not reported.