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Table 2 Newcastle-Ottawa Scale (NOS) for the quality assessment of the studies included

From: A microRNA binding site polymorphism in the 3′ UTR region of VEGF-A gene modifies colorectal cancer risk based on ethnicity: a meta-analysis

Study Case definition adequate Representativeness of the cases Selection of controls Definition of controls Comparability based on design or analysis analysis ascertainment of exposure Same method of ascertainment for cases and controls Non-response rate Total scores
Yang et al. 2017 [39] - 8
Ahmad et al. 2016 [40] - - 6
Jannuzzi et al. 2014 [41] - - 7
Credidio et al. 2014 [42] - 8
Lau et al. 2014 [43] - 7
Jang et al. 2013 [44] - 7
Antonacopoulou et al. 2011 [45] - 7
Wu et al. 2011 [46] - 7
Wu et al. 2009 [47] - 8
Ungerbäck et al. 2009 [48] - 8
Bae et al. 2008 [49] - - 7
Chae et al. 2008 [50] - 7
Hofmann et al. 2008 [51] - 7
  1. OR odds ratio, CI confidence interval, I2 I square; each star represents the fulfilled individual criteria within the subsection