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Table 2 Risk of Bias of Retrospective Cohort studies according to the Newcastle-Ottawa Scale

From: Mitral valve re-repair vs replacement following failed initial repair: a systematic review and meta-analysis

Author (Year)

Selection

Comparability

Outcome

Total Score

1

2

3

4

5

6

7

8

Nishida et al. [7]

*

*

*

*

–

*

*

*

6

Zegdi (Late) et al. [9]

*

*

*

*

–

*

*

*

6

Zegdi et al. [11]

*

*

*

*

–

*

*

*

6

Kwedar et al. [12]

*

*

*

*

–

*

*

*

6

Ma et al. [13]

*

*

*

*

–

*

*

*

6

Kilic et al. [14]

*

*

*

*

–

*

*

*

6

Gillinov et al. [15]

*

*

*

*

–

*

*

*

6

Suri et al. [16]

*

*

*

*

–

*

*

*

6

Dumont et al. [17]

*

*

*

*

–

*

*

*

6

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Journal of Cardiothoracic Surgery

ISSN: 1749-8090

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