Radiofrequency ablation in the treatment of small hepatocellular carcinoma: A meta analysis

Table 1 Outcome data and methodological quality of studies included in the meta-analysis

Author	Yr	Study design	RFA (cases)	Hepatectomy (cases)	Journal	Quality evaluation score1
Peng et al[8]	2008	Retrospective study	251	183	Zhongguo Shiyong Waike Zazhi	7
Vivarelli et al[9]	2004	Cohort study	58	40	Ann Surg	7
Zhang et al[10]	2007	Retrospective study	15	29	Disan Junyi Daxue Xuebao	7
Zhou et al[11]	2007	Retrospective study	47	40	Gandan Waike Zazhi	7
Guglielmi et al[12]	2008	Retrospective study	109	91	J Gastrointest Surg	7
Montorsi et al[13]	2005	Cohort study	79	79	J Gastrointest Surg	7
Hong et al[14]	2005	Cohort study	55	93	J Clin Gastroenterol	9
Wakai et al[15]	2006	Retrospective study	21	85	World J Gastroenterol	7
Cho et al[16]	2005	Retrospective study	99	61	Korean J Hepatol	9
Gao et al[17]	2007	Retrospective study	53	34	Zhongguo Yixue Yingxiang Jishu Zazhi	9

¹The score from the non-randomized controlled clinical trial quality evaluation standard. RFA: Radiofrequency ablation.