Table 3.

Quality assessment of the included RCTs

Study	Randomization	Sequence generation	Allocation concealment	Blinding of participants	Blinding of assessors	Selective reporting
Bojang 2011 [16]	Done	Done	Not done	Not done	Not clear	No
D’Alessandro 1995 [50]	Not clear	Not clear	Not done	Not done	Not done	No
D’Alessandro 1995 [9]	Not clear	Not clear	Not done	Not done	Not done	No
D’Allessandro 1996 [19]	Not clear	Not clear	Not done	Not done	Not done	No
Eriksen 2010 [18]	Done	Done	Not done	Not done	Not clear	No
Ter Kuile 2003 [31]	Done (Not clear)	Not clear	Not done	Not done	Not clear	No
Greenwood 1989 [26]	Not clear	Not clear	Not done	Not done	Not clear	No
Hawley 2003 [10]	Done (Not clear)	Not clear	Not done	Not done	Not clear	No
Kidane 2000 [28]	Done (Not clear)	Not clear	Not done	Not done	Not clear	No
Krezonoski 2010 [30]	Done	Not done	Not done	Not done	Not clear	No
Kuile 2003 [22]	Done (Not clear)	Not clear	Not done	Not done	Not clear	No
Kweku 2009 [32]	Done	Not done	Not done	Not done	Not clear	No
Macintyre 2003 [33]	Done (Not clear)	Not clear	Not done	Not done	Not clear	No
Sharma 2009 [42]	Done (Not clear)	Not clear	Not done	Not done	Not clear	No
Staedke 2009 [44]	Done	Done	Not done	Not done	Not clear	No
Tagbor 2011 [45]	Done (Not clear)	Not clear	Not done	Not done	Not clear	No
Thang 2009 [47]	Done	Done	Not done	Not done	Not clear	No