Table 2

MINORS score for the identified PP cohort studies

Criteria	Burton-Papp et al 17	Caputo et al 18	Coppo et al 16	Ding et al 22	Dong et al ²³	Elharrar et al 24	Lawton et al 28	Retucci et al 32	Sartini et al 34
1. A clearly stated aim	1	1	2	2	1	2	1	2	1
2. Inclusion of consecutive patients	1	2	0	1	0	2	1	2	0
3. Prospective collection of data	0	2	2	2	0	2	0	2	1
4. Endpoints appropriate to the aim of the study	1	1	2	2	1	1	1	1	1
5. Unbiased assessment of the study endpoint	1	1	1	1	1	1	0	1	1
6. Follow-up period appropriate to the aim of the study	2	1	2	1	1	1	2	0	1
7. Loss to follow-up less than 5%	1	1	1	1	0	1	2	1	1
8. Prospective calculation of study size	0	0	2	2	0	0	0	0	0
9. An adequate control group	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
10. Contemporary groups	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
11. Baseline equivalence of groups	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
12. Adequate statistical analysis	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Total score	7	9	12	12	4	10	7	9	6

Each criteria is scored either: 0 (not reported), 1 (reported but inadequate) or 2 (reported and adequate). The ideal score is 16 for non-comparative studies and 24 for comparative studies.
PP, prone positioning.