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Table 2 Quality assessment of warfarin studies in patients with end stage renal disease and atrial fibrillation

From: Warfarin use and stroke, bleeding and mortality risk in patients with end stage renal disease and atrial fibrillation: a systematic review and meta-analysis

Study Overall Risk of Bias Bias due to confounding Bias in selection of participant into the study Bias in measurement of interventions Bias due to departures from intended interventions Bias due to missing data Bias in measurement of outcomes Bias in selection of the reported results
Chan 2009 [30] Serious Moderate Serious Low Low Low Low Moderate
Lai 2009 [32] Critical Critical Serious Serious Serious No info Low Moderate
Wizemann 2010 [33] Critical Serious Critical Moderate No info No info Moderate Serious
Winkelmayer 2011 [22] Moderate Moderate Low Low Low Low Low Moderate
Olesen 2012 [23] Serious Serious Low Low Serious Low Low Moderate
Khalid 2013 [34] Critical Critical Critical Moderate Serious No info Low Moderate
Wakasugi 2014 [29] Critical Critical Serious Low Low No info Low Moderate
Bonde 2014 [24] Serious Serious Low Moderate Serious Low Low Serious
Carrero 2014 [25] Moderate Moderate Low Low Low Low Low Moderate
Chen 2014 [26] Moderate Moderate Low Low Low Low Low Moderate
Friberg 2014 [13] Serious Moderate Serious Low Low Low Low Moderate
Shah 2014 [27] Moderate Moderate Low Low Low Low Low Moderate
Genovesi 2015 [31] Serious Moderate Serious Low Low No info Low Moderate
Chan KE 2015 [20] Serious Moderate Low Low Serious Low Low Moderate
Chan PH 2015 [21] Critical Serious Critical Low Serious Low Moderate Moderate
Shen 2015 [28] Moderate Moderate Low Low Low Low Low Moderate
Wang 2015 [14] Critical Serious Critical Low Serious No info Moderate Serious
Yodogawa 2015 [35] Critical Serious Critical Moderate No info Low Moderate Moderate
Findlay 2016 [15] Critical Critical Critical No info Critical No info Moderate Moderate
Tanaka 2016 [16] Critical Critical Critical Low Critical Low Moderate Moderate