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