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Table 2 Quality assessment of retrospective studies

From: Polyetheretherketone (PEEK) rods versus titanium rods for posterior lumbar fusion surgery: a systematic review and meta-analysis

 

Li 2015

Han 2016

Lu 2017

Pang 2020

Yang 2015

Yu 2012

Xu 2012

Purpose of the research is clear

2

2

2

2

2

2

2

Consistency of enrolled patients

1

1

1

1

1

1

1

Collection of expected data

2

2

2

2

2

2

2

Outcomes that appropriately reflect the purpose of the study

2

2

2

2

2

2

2

Objectivity of outcome measures

1

1

1

1

1

1

1

Adequate follow-up time

2

2

2

2

2

1

2

Loss to follow-up rate is less than 5%

2

2

2

2

2

2

2

Estimated sample size

1

1

1

1

1

1

1

Appropriate selection of the control group

2

2

2

2

2

2

2

Control group synchronization

1

1

1

1

1

1

1

Baseline comparable between groups

2

2

2

2

2

2

2

Statistical analysis is appropriate

2

2

2

2

2

2

2

Total

20

20

20

20

20

19

20

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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X