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Table 2 Risk of bias of the included studies

From: Dental implants and diabetes mellitus—a systematic review

Author Year Study type Selection bias (homogeneity and confounders) Performance bias (fidelity to protocol) Attrition bias (loss of participants) Detection bias (reliable measures) Reporting bias (selective reporting or conflict interests) Summary assessment risk of bias
Alsaadi 2007 Retrospective H U U L L L
Aguilar-Salvatierra 2015 Prospective H L L L L L
Anner 2010 Retrospective H U U L L M
Busenlechner 2014 Retrospective H L U L L L
Daubert 2015 Cross-sectional H L U L L L
Dowell 2007 Prospective H L L L M M
Erdogan 2014 Prospective H L L L M M
Ferreira 2006 Cross-sectional H L L L L L
Fiorellini 2000 Retrospective H M U M L M
Ghiraldini 2015 Prospective H L L L L L
Gomez-Moreno 2014 Prospective H L L L L L
Khandelwal 2011 Prospective L L L M L L
Morris 2005 Prospective H L L M L M
Moy 2005 Retrospective H L U M L M
Oates 2009 Prospective H L L L L L
Oates 2014 Prospective H L M L L L
Olson 2000 Prospective, multicenter H L U L L L
Peled 2003 Retrospective H L U M L M
Tawil 2008 Prospective H L L M L M
Tatarakis 2013 Prospective H L L L L L
Turkyilmaz 2010 Retrospective H L U L L L
Zupnik 2011 Retrospective H L U M L M
  1. L low, M medium, H high, U unknown risk of bias