CD147 as a Novel Prognostic Biomarker for Hepatocellular Carcinoma: A Meta-Analysis

Table 2

NOS score of included studies.

Column	Entries	First author
		Li, 2005	Zhang, 2006	Zhang, 2007	Wan, 2012	Li, 2010	Luo, 2011	Zhan, 2014	Zhu, 2015
Section	Is the definition adequate	☆	☆	☆	☆	☆	☆	☆	☆
	Representativeness of the cases	☆	☆	☆	☆	☆	☆	☆	☆
	Selection of controls	☆				☆	☆
	Definition of controls	☆	☆	☆	☆	☆	☆	☆	☆
Comparability	Comparability of cases and controls on the basis of the design and analysis	☆	☆	☆	☆	☆	☆	☆	☆
	Ascertainment of exposure	☆	☆	☆	☆				☆
Exposure	Same method of ascertainment for cases and controls	☆	☆	☆	☆			☆	☆
	Nonresponse rate		☆	☆	☆	☆	☆	☆	☆
Total scores		7	7	7	7	6	6	6	7