Table 7.

Quality of included studies as quantifies by MINORS Quality Appraisal Tool

Authors, Year	Item 1		Item 2		Item 3		Item 4		Item 5		Item 6		Item 7		Item 8		Item 9		Item 10		Item 11		Item 12		Mean	% of max score
Khalil et al.	2	2	2	2	1	1	2	2	2	2	2	2	2	2	0	0	1	1	1	1	2	2	2	2	19	79
Padilla et al.	2	2	2	2	1	1	2	2	1	1	2	2	2	2	2	2	2	2	2	2	2	2	2	2	22	92
Heng et al.	2	2	2	2	1	1	2	2	2	2	2	2	2	2	2	2	0	0	0	0	2	2	2	2	19	79
Austin et al.	2	2	2	2	2	2	2	2	2	2	2	2	1	1	1	0	0	0	0	0	2	2	2	2	18	75
Shim et al.	2	2	2	2	2	2	2	2	1	1	2	2	2	2	2	2	1	0	0	0	2	2	2	2	19.5	81
Shaw et al.	2	2	2	2	2	2	2	2	2	2	2	2	1	1	0	0	2	2	2	2	2	2	2	2	21	88
Darrith et al.	2	2	2	2	1	1	2	2	2	2	2	2	2	1	1	1	0	0	0	0	2	2	2	2	17	71
Nwanko et al.	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	0	0	0	0	2	2	2	2	20	83
Stiegel et al.	2	2	2	2	2	2	2	2	2	2	2	2	2	2	1	0	1	0	0	0	2	2	2	2	19	79
Lawrie et al.	2	2	2	2	1	1	2	2	2	2	2	2	2	2	0	0	1	1	2	2	2	2	2	2	19.5	81
Tang et al.	2	2	2	2	1	1	2	2	2	2	2	2	2	2	0	0	0	0	1	1	2	2	2	2	18	75
Kagan et al.	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	0	0	0	0	2	2	2	2	20	83
Melnic et al.	2	2	2	2	1	1	2	2	2	2	2	2	2	2	0	0	0	0	1	1	2	2	2	2	18	75
Frye et al.	2	2	2	2	2	2	2	2	2	2	2	2	2	2	0	0	1	1	1	1	2	2	2	2	20	83

Roman values: reviewer 1; italic values: reviewer 2

MINORS Methodological Index for Non-Randomized Studies

*Scores out of 2 possible points with a maximum of 24 for comparative studies