Table 2 Methodological quality of the randomized controlled trials
Study | Random sequence generation | Allocation concealment | Blinding of participates and personal | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other bias |
|---|---|---|---|---|---|---|---|
Kinov, 2005 | Low risk | Low risk | Unclear risk | Unclear risk | Low risk | Low risk | Unclear |
Yamasaki, 2006 | Low risk | Low risk | Unclear risk | Unclear risk | Low risk | Low risk | Unclear |
Skoldenberg, 2011 | Low risk | Low risk | Low risk | Unclear risk | Low risk | Low risk | Unclear |
Muren, 2015 | Low risk | Low risk | Low risk | Unclear risk | Low risk | Low risk | Unclear |