Table 3.

The Minors quality score of the non-RCTs

First author, year	Minors scale
	1	2	3	4	5	6	7	8	9	10	11	12	Total
Ducic 2016 [6]	2	1	1	2	0	2	2	0	2	2	1	2	17
Kazimoglu 2009 [7]	2	2	2	2	2	2	2	2	2	1	2	2	23
Keskin 2014 [12]	2	2	0	2	0	2	2	0	2	1	1	2	16
Ozkoc 2004 [14]	2	2	1	2	2	1	2	2	2	2	2	2	22

Numbers 1–12 in heading signified the following: 1 a clearly stated aim, 2 inclusion of consecutive patients, 3 prospective collection of data, 4 endpoints appropriate to the aim of the study, 5 unbiased assessment of the study endpoint, 6 follow-up period appropriate to the aim of the study, 7 loss to follow-up less than 5%, 8 prospective calculation of the study size, 9 an adequate control group, 10 contemporary groups; 11 baseline equivalence of groups, and 12 adequate statistical analyses