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. 2017 Aug 9;8(45):79854–79863. doi: 10.18632/oncotarget.20078

Table 4. Newcastle-Ottawa scale for quality assessment of included studies.

Study Selection Comparability Outcome Overall
Representativeness of exposed cohort Selection of
nonexposed		 Ascertainment of exposure Outcome not present at start Assessment
of outcome		 Adequate follow-up length Adequacy of follow-up
Aizer 2009 ✰ ✰ ✰ ✰ ✰✰ ✰ ✰ 8
Hamdy 2016 ✰ ✰ ✰ ✰ ✰✰ ✰ ✰ ✰ 9
Kibel 2012 ✰ ✰ ✰ ✰ ✰✰ ✰ ✰ 8
Kim 2014 ✰ ✰ ✰ ✰ ✰✰ ✰ ✰ 7
Merino 2013 ✰ ✰ ✰ ✰ ✰✰ ✰ 7
Nguyen 2008 ✰ ✰ ✰ ✰✰ ✰ ✰ 7
Shinohara 2013 ✰ ✰ ✰ ✰ ✰✰ ✰ 7
Taguchi 2015 ✰ ✰ ✰ ✰ ✰✰ ✰ 7
Takizawa 2009 ✰ ✰ ✰ ✰ ✰✰ ✰ ✰ 8
Yamamoto 2013 ✰ ✰ ✰ ✰ ✰✰ ✰ ✰ ✰ 9
Yamamoto 2016 ✰ ✰ ✰ ✰ ✰✰ ✰ 7
Zelefsky 2010 ✰ ✰ ✰ ✰✰ ✰ ✰ ✰ 8