Table 2 Quality measure of included studies in the meta-analysis
Random sequence generation | Allocation concealment | Blinding of participants and personnal | Incomplete outcome data addressed | Intention-to-treat analysis | Selecting reporting | |
|---|---|---|---|---|---|---|
Kiran 2005 | ? | ? | ? | + | ? | + |
Chen 2012 | + | ? | + | + | - | + |
Moeintaghavi 2012 | + | ? | ? | + | ? | + |
Koromantzos 2012 | + | + | + | + | + | + |
Singh 2008 | ? | - | + | + | ? | + |
Zhang 2013 | + | + | + | + | - | + |
Engebretson 2013 | + | + | + | + | + | + |
Gay IC 2014 | + | + | + | + | + | + |
Raman RP 2014 | + | ? | ? | + | ? | + |