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Table 2 Quality assessment according to the Newcastle–Ottawa scale of the non-randomized studies

From: Arthroscopic wafer procedure versus ulnar shortening osteotomy for ulnar impaction syndrome: a systematic review and meta-analysis

Study ID

Selection

Comparability

Exposure

Total score

Bernstein 2004

2

1

2

5

Constantine 2000

2

1

1

4

Auzias 2020

4

1

2

7

Oh 2018

3

2

2

7

Chen 2020

3

2

2

7

Smet 2014

2

1

1

4

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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X