Author | Year | Study typea | Random sequence generation | Allocation concealment (selection bias) | Blinding of participants and personnel (performance bias) | Blinding of outcome assessment (detection bias) | Incomplete outcome data (attrition bias) | Selective reporting (reporting bias) | NOS score | Quality of studies includedb |
---|---|---|---|---|---|---|---|---|---|---|
Dabbagh | 2015 | RCT | Low risk | Low risk | High risk | Low risk | Low risk | High risk | - | High quality |
Hu | 2013 | RCT | High risk | High risk | High risk | High risk | Low risk | High risk | - | Low quality |
Lee | 2010 | RCT | Low risk | Low risk | High risk | Low risk | Low risk | High risk | - | High quality |
Saad | 2013 | RCT | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk | - | High quality |
Chenkan | 2013 | nRCS | - | - | - | - | - | - | 7 | High quality |
Hosogi | 2011 | nRCS | - | - | - | - | - | - | 5 | Low quality |