Table 2 Study quality and risk of bias assessment of included studies according to the Cochrane Collaboration’s tool
Fist author (year) | Random Sequence Generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective outcome reporting | Overall qualitya |
|---|---|---|---|---|---|---|---|
Moradi (2021) [82] | L | L | L | L | L | L | L |
Safaeiyan (2018) [81] | L | U | L | L | L | L | U |
Mocellin (2017) [79] | L | L | L | L | L | L | L |
Payahoo (2017) [78] | L | U | L | L | L | L | U |
Werner (2017) [80] | L | L | L | U | L | L | U |
Berge (2014) [64] | L | U | L | U | L | L | U |
Damsbo-Svendsen (2013) [83] | L | L | L | L | L | L | L |
Kanat (2013) [76] | U | U | U | U | L | L | U |
Miller (2013) [77] | L | U | L | L | L | L | U |
Vakhapova (2011) [52] | L | U | L | U | L | L | U |
Irving (2009) [75] | L | U | U | U | L | L | U |
Liu (2007) [74] | L | H | H | H | L | L | H |
Yehuda (2005) [47] | H | H | H | H | H | H | H |
Jatoi (2004) [73] | L | U | L | U | L | L | U |
Bruera (2003) [72] | U | U | L | U | L | L | U |