Table 3.

Quality assessment (Cochrane risk of bias)

Study	Random bias	Blinding bias	Deviations from intended interventions	Missing outcome data	Outcome measurement bias	Selective reporting bias	Overall risk of bias
Brisinda et al, 1999	Low	Low	Low	Low	Low	Low	Low
Brisinda et al (2007)	Low	Low	Low	Low	Low	Low	Low
Minguez et al (2002)	Low	Moderate	Low	Moderate	Low	Low	Moderate
Maria et al, 1998	Low	Moderate	Low	Low	Low	Low	Low
Gupta et al, 2014	Low	Low	Low	Low	Low	Low	Low
Mentes et al, 2003	Low	Low	Low	Low	Low	Low	Low
Nasr et al, 2010	Low	Moderate	Low	Moderate	Low	Low	Moderate
Lindsey et al, 2003	Low	Moderate	Low	Low	Low	Low	Low
De Nardi et al, 2006	Low	Low	Low	Low	Low	Low	Low
Brisinda et al, 2004	Low	Low	Low	Low	Low	Low	Low
Sileri et al, 2007	Low	Moderate	Low	Moderate	Low	Low	Moderate
Algaithy et al, 2008	Low	Moderate	Low	Low	Low	Low	Low
Arroyo et al, 2005	Low	Low	Low	Low	Low	Low	Low
Festen et al (2009)	Low	Low	Low	Low	Low	Low	Low
Asim et al, 2014	Low	Moderate	Low	Moderate	Low	Low	Moderate
Valizadeh et al, 2012	Low	Moderate	Low	Low	Low	Low	Low
Jost et al (1993)	Low	Low	Low	Low	Low	Low	Low
Jones et al (2006)	Low	Low	Low	Low	Low	Low	Low
Lysy et al (2001)	Low	Moderate	Low	Moderate	Low	Low	Moderate
Thornton et al (2005)	Low	Moderate	Low	Low	Low	Low	Low
Gandomkar et al (2015)	Low	Low	Low	Low	Low	Low	Low
Samim et al (2012)	Low	Low	Low	Low	Low	Low	Low
Iswariah et al (2005)	Low	Moderate	Low	Moderate	Low	Low	Moderate