Results from quality assessments
The quality details of bias assessment are presented in Table
2, and the Cochrane Collaboration tool was applied for evaluating the
risk of bias 32.
Briefly, participant’s random allocation was mentioned in all included
trials. However, eight trials described the method of random sequence
generation15-17,21-24,26.
Five trials reported allocation concealment15,17,22,25,37.
Most studies represented low risk of bias based on selective reporting;
nevertheless, 5 studies had high risk of bias17,18,23,24,35.
All studies had a low risk of bias for incomplete outcome data. Five
studies had a low risk of bias for blinding of participants and
personnel15,18,21,22,25and six studies had high risk of bias regarding blinding outcome
assessors15,16,22,26,37,39.
All of studies had low or unclear risk of bias regarding other potential
threats to validity.