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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