Table 3 Qualitative risk of bias assessment summary
Study | Sequence generation | Allocation concealment | Blinding of personnel and participants | Blinding of outcomes | Incomplete outcome data addressed | Free of selective reporting | Free of other bias |
|---|---|---|---|---|---|---|---|
Askar 2011 [19] | Yes | Yes | Yes | Yes | Unclear | Yes | Yes |
Cannizzaro 2014 [12] | Yes | Yes | Yes | Yes | Yes | No | Yes |
Di Renzo 2010 [18] | Unclear | Unclear | Yes | Yes | Yes | Unclear | Yes |
Docimo 2012 [16] | Unclear | Unclear | Yes | Yes | Yes | Unclear | Yes |
Duan 2013 [14] | Unclear | Unclear | Yes | Yes | Unclear | Unclear | Yes |
Ferri 2011 [20] | Yes | Unclear | Yes | Yes | Yes | Unclear | Yes |
Gentileschi 2011 [21] | Yes | Unclear | Yes | Yes | Unclear | Unclear | Yes |
Konturek 2012 [9] | Yes | Yes | Yes | Yes | Yes | Unclear | Yes |
Materazzi 2013 [17] | Yes | Yes | Yes | Yes | Yes | Unclear | Yes |
Miccoli 2010 [10] | Yes | Yes | Yes | Yes | Unclear | Unclear | Yes |
Mourad 2011 [22] | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Pons 2009 [8] | Yes | Unclear | Yes | Yes | Yes | No | Yes |
Sista 2012 [13] | Unclear | Unclear | Yes | Yes | Unclear | No | Yes |
Soroush 2013 [15] | Unclear | Unclear | Yes | Yes | Unclear | Unclear | Yes |