Author and year of publication | Study Participation | Study Attrition | Outcome Measurement | Statistical Analysis and Reporting | Risk of bias assessment |
---|---|---|---|---|---|
General population studies | |||||
 Abujam et al. 2014 [49] | No | N/A | Yes | Yes | High |
 Adams et al. 2013 [35] | Yes | N/A | Yes | Yes | Low |
 Auvinen et al. 2009 [50] | No | N/A | Partly | Yes | High |
 Bishop et al. 2012 [51] | No | N/A | Yes | Yes | High |
 Diepenmaat et al. 2006 [36] | Yes | N/A | Yes | Yes | Low |
 Ehrmann Feldman et al. 2002 [37] | Yes | Yes | Partly | Yes | Low |
 El-Metwally et al. 2006 [15] | Yes | N/A | Yes | Yes | Low |
 Hoftun et al. 2011 [38] | Yes | N/A | Yes | Yes | Low |
 Hulsegge et al. 2011 [47] | Partly | Yes | Partly | Yes | Medium |
 Jespersen et al. 2014 [14] | Yes | Yes | Yes | Yes | Low |
 Jespersen et al. 2015 [39] | Yes | N/A | Yes | Yes | Low |
 Krul et al. 2009 [40] | Yes | N/A | Yes | Yes | Low |
 Mikkelsson et al. 1997 [41] | Yes | N/A | Yes | Yes | Low |
 Molgaard et al. 2011 [48] | Partly | N/A | Yes | Yes | Medium |
 Rathleff et al. 2013 [42] | Yes | N/A | Yes | Yes | Low |
 Shrier et al. 2001 [43] | Yes | Yes | Partly | Yes | Low |
 Slowinska et al. 2015 [68] | No | N/A | Yes | Partly | High |
 Smedbraten et al. 1998 [52] | No | N/A | Yes | Yes | High |
 Verhagen et al. 2009 [54] | Yes | No | Yes | Yes | High |
Clinical studies | |||||
 Bot et al. 2005 [44] | Yes | N/Aa | Yes | Partly | Low |
 Henschke et al. 2014 [45] | Yes | N/Aa | Yes | Yes | Low |
 Van der Waal et al. 2006 [46] | Yes | N/Aa | Yes | Yes | Low |