Table 5.

Results of quality assessment of accepted trials

Article	DS	Selection bias		Detection/Performance bias	Attrition bias		Trial outcome
		Randomisation	Baseline data	Blinding/Masking	Loss-to-follow up	Run-in phase
Welbury et al., 1991 [20]	01	0	0	0	A	A	A
Östlund et al., 1992 [21]	02	0	0	0	B	A	A
Taifour et al., 2002 [22]	03	0	A	0	A	A	A
	04	0	A	0	A	A	A
Mandari et al., 2003 [23]	05	0	0	0	B	A	A
Frencken et al., 2007 [24]	06	0	A	0	A	A	A
Daou et al., 2009 [25]	07	0	0	0	A	A	A
	08	0	0	0	A	A	A
Mandari et al., 2001 [27]	09	0	0	0	B	A	A
Yu et al., 2004 [28]	10	0	0	0	A	A	A
	11	0	0	0	A	A	A
Svanberg, 1992 [29]	12	0	0	0	A	A	A
	13	0	0	0	A	A	0
Qvist et al., 1997 [26]	14	0	0	0	B	A	A
	15	0	0	0	A	A	0
	16	0	0	0	A	A	0
	17	0	0	0	A	A	0

DS = Dataset number.