Table 2 Study quality assessment
Authors | Sequence generation | Allocation concealment | Blindinga | Incomplete outcome data | Baseline comparability |
|---|---|---|---|---|---|
Barnett, 2003 [32], | Unclear | Low | Low | Low | Low |
Bischoff-Ferrari, 2010 [12] | Low | Low | Low | Low | Low |
Campbell, 1997 [17] | Low | Low | Unclear | High | Low |
El-Khoury, 2015 [19] | Low | Low | Low | Low | Low |
Elley, 2008 [20] | Low | Low | Low | Low | Low |
Fitzharris, 2010 [21] | Low | Low | Low | Unclear | Low |
Freiberger, 2012 [22] | Low | Low | Low | Low | Low |
Haines, 2009 [23] | Low | Low | Low | Low | Low |
Iliffe, 2014 [24] | Low | Low | High | Low | High |
Iwamoto, 2009 [33] | Unclear | Unclear | Unclear | Low | High |
Kim, 2014 [25] | Low | Low | Low | Low | Low |
Li, 2005 [34] | Low | Unclear | Low | Low | Low |
Luukinen, 2007 [26] | Low | Unclear | Low | Low | Low |
MacRae, 1994 [35] | Unclear | Low | Low | Low | Low |
Means, 2005 [27] | Low | Unclear | Unclear | Low | High |
Pang, 2018 [28], | Low | Low | Low | Low | Low |
Patil 2015 [29] | Unclear | Unclear | Unclear | Low | Low |
Reinsch, 1992 [36] | Unclear | Unclear | Unclear | Low | Unclear |
Robertson, 2001 [37] | Low | Low | Low | Low | Low |
Rosendahl, 2008 [38] | Low | Low | Low | Low | Low |
Schnelle, 2003 [39] | Low | Low | Low | Low | Low |
Smulders, 2010 [40] | Low | Unclear | Low | High | Low |
Taylor-Piliae, 2014 [30] | Low | Low | Low | Low | Low |
Uusi-Rasi, 2015 [31] | Low | Low | Low | Low | Low |
von Stengel, 2009 [41] | Low | Low | Low | Low | Low |