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Table 2 Quality assessment of included studies 1

From: Insulin and risk of diabetic retinopathy in patients with type 2 diabetes mellitus: data from a meta-analysis of seven cohort studies

Author Quality assessment criteria
  Selection Comparability Outcome Overall quality
Gunnlaugsdottir E 2012 ** ** ** 6
Geir Bertelsen 2012 ** ** ** 6
Schweitzer K 2009 *** ** *** 8
Romero-Aroca P 2007 ** ** *** 7
Hove MN 2004 *** ** ** 7
Henricsson M 1996 ** ** ** 6
Deng Y 2014 *** ** *** 8
  1. 1the Newcastle-Ottawa Scale (NOS) was obtained to assess the methodological quality of the included studies.
  2. **Two points; ***Three points.