Table 2

Quality assessment of non-randomised studies

Methodological item for non-randomised studiesPark etal12Wang et al13Burkhardt et al14Yu et al15Jia et al16Kim etal17
1. A clearly stated aim222222
2. Inclusion of consecutive patients 222222
3. Prospective collection of data 202020
4. End points appropriate to the aim of the study 222222
5. Unbiased assessment of the study end point 000000
6. Follow-up period appropriate to the aim of the study 222222
7. Loss to follow-up less than 5% 001000
8. Prospective calculation of the study size 000000
9. An adequate control group 222222
10. Contemporary groups 222222
11. Baseline equivalence of groups 222222
12. Adequate statistical analyses 222222