Table 3 The quality and risk of bias in the trials included in the analysis
Study/year/reference | Random sequence generation (selection bias) | 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) | Other bias |
|---|---|---|---|---|---|---|---|
Savino/2007 [24] | Low risk | Low risk | High risk | Low risk | Low risk | Low risk | Low risk |
Savino/2010 [25] | Low risk | Unclear risk | Low risk | Low risk | Low risk | Low risk | Low risk |
Szajewska/2013 [26] | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk |