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Table 2 Newcastle–Ottawa scale for quality assessment

From: The association of obstructive sleep apnea and renal outcomes—a systematic review and meta-analysis

Study

Selection bias

Respiratory measurement

Blinding

Study design

Analysis

Overall

Faulx 2007 [31]

Moderate

Strong

Weak

Weak

Strong

Moderate

Tsioufis 2008 [9]

Strong

Strong

Weak

Weak

Strong

Strong

Agrawal 2009 [32]

Moderate

Strong

Strong

Weak

Strong

Strong

Laaban 2009 [33]

Moderate

Moderate

Weak

Weak

Moderate

Moderate

Canales 2011 [5]

Weak

Moderate

Weak

Weak

Strong

Weak

Buyukaydin 2012 [8]

Weak

Strong

Weak

Weak

Weak

Weak

Kanbay 2012 [34]

Moderate

Strong

Weak

Weak

Moderate

Weak

Furukawa 2013 [35]

Weak

Moderate

Weak

Weak

Strong

Weak

Sakaguchi 2013 [36]

Weak

Strong

Weak

Moderate

Moderate

Moderate

Tahrani 2013 [37]

Weak

Strong

Weak

Strong

Strong

Strong

Leong 2014 [38]

Strong

Strong

Strong

Moderate

Strong

Strong

Storgaard 2014 [39]

Strong

Strong

Weak

Weak

Weak

Moderate

Bulcun 2015 [40]

Strong

Strong

Weak

Moderate

Strong

Strong

Zhang 2015 [42]

Moderate

Moderate

Weak

Weak

Moderate

Moderate

Chang 2016 [43]

Strong

Strong

Weak

Weak

Strong

Strong

Uyar 2016 [41]

Strong

Strong

Weak

Weak

Moderate

Moderate

Zhang 2016 [44]

Strong

Moderate

Weak

Moderate

Strong

Moderate

Adams 2017 [45]

Moderate

Strong

Weak

Weak

Strong

Moderate