Study or subgroup | Random sequence generation | Allocation concealment | Blinding: participants and personnel | Incomplete outcome data | Overall risk |
---|---|---|---|---|---|
Crooks 2006 [16] | unclear | unclear | unclear | adequate | high |
Crooks 2010 [17] | unclear | unclear | unclear | adequate | high |
Jones 2014 [14] | unclear | unclear | unclear | adequate | high |
Shing 2007 [18] | adequate | adequate | adequate | adequate | low |
Shing 2013 [19] | adequate | adequate | adequate | unclear | moderate |