Prognostic Value of MACC1 in Digestive System Neoplasms: A Systematic Review and Meta-Analysis

Table 2

Summary of Newcastle-Ottawa quality assessment scale.

	Newcastle-Ottawa scale category			Total
	Selection	Comparability	Outcome
Stein et al., 2012 [12, 13]
Zhang et al., 2012 [14]
Kang et al., 2013 [15]
Zhen et al., 2014 [16]
Stein et al., 2009 [3]
Isella et al., 2013 [25]
Kawamura et al., 2012 [26]
Ge et al., 2011 [17]
Guo et al., 2013 [18]
Wang et al., 2013 [5]
Zhu et al., 2013 [9]
Yang et al., 2013 [19]
Qiu et al., 2011 [10]
Qu et al., 2012 [20]
Ding et al., 2013 [21]
Xie et al., 2013 [22]
Ji et al., 2014 [23]
Gao et al., 2014 [24]

The scale includes eight items in total with four items in selection category, one item in comparability category, and three items in outcome category. Stars were given to high-quality elements. Having five or more stars is considered good quality.