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Table 2 Quality assessment of nonrandomized studies (Methodological Index for Nonrandomized Studies)

From: Diabetes mellitus does not increase the risk of knee stiffness after total knee arthroplasty: a meta-analysis of 7 studies including 246 053 cases

MINORS criteria Cartwright-Terry et al. [18] 2018 Clement et al. [17] 2018 Dowdle et al. [19] 2018 Issa et al. [8] 2015 Pfefferle et al. [16] 2014 Gandhi et al. [4] 2006 Meding et al. [12] 2003
A clearly stated aim 2 2 2 2 2 2 2
Inclusion of consecutive patients 2 2 2 2 2 2 2
Prospective collection of data 2 1 0 0 0 0 0
Endpoints appropriate to the aim of the study 2 2 2 2 2 2 2
Unbiased assessment of the study endpoint 0 0 0 0 0 0 0
Follow-up period appropriate to the aim of the study 2 2 2 2 2 2 2
Loss to follow-up less than 5% 2 0 2 1 2 2 1
Prospective calculation of the study size 1 1 2 1 2 1 2
An adequate control group 2 1 1 2 2 2 2
Contemporary groups: 2 2 2 2 2 2 2
Baseline equivalence of groups 2 2 2 1 2 2 1
Adequate statistical analyses 2 2 2 2 2 2 2
Total score 21 17 19 17 20 19 18