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Table 3 Study quality assessment using the Newcastle-Ottawa Scale for nonrandomized studies

From: Repair or replace ischemic mitral regurgitation during coronary artery bypass grafting? A meta-analysis

  Selection   Outcome
First author, year of publication (reference) Representativeness of exposed cohort Selection of nonexposed cohort Ascertainment of exposure Outcome of interest absent at start of study Comparability (Based on design and analysis) Assessment of outcome Follow-up long enough for outcomes to occur Adequacy of follow-up Total score
Lorusso et al. 1 1 1 1 0 1 1 1 7
Lio et al. 1 1 1 1 1 1 1 1 8
Ljubacev et al. 1 1 1 1 0 1 0 1 6
Roshanali et al. 1 1 1 1 2 1 1 1 9
Maltais et al. 1 1 1 1 2 1 1 1 9
Qiu et al. 1 1 1 1 2 1 1 1 9
Micovic et al. 1 1 1 1 2 1 1 1 9
Bonacchi et al. 1 1 1 1 2 1 1 1 9
Silberman et al. 1 1 1 1 1 1 1 1 8
Mantovani et al. 1 1 1 1 2 1 1 1 9
Reece et al. 1 1 1 1 1 1 0 1 7