Anterior Cervical Discectomy and Fusion Using Zero-P System for Treatment of Cervical Spondylosis: A Meta-Analysis
Table 2
Newcastle-Ottawa Scale evaluation of observational studies.
Methodological quality assessment for inclusion in observational studies (score)
Research
Study population selection
Intergroup comparison (2 points)
Measurement of exposure factors
Total (9 points)
A (1 point)
B (1 point)
C (1 point)
D (1 point)
E (1 point)
F (1 point)
G (1 point)
Alimi, 2016
1
1
1
0
2
1
1
0
7
Li, 2017
1
1
1
0
2
0
1
0
6
Liu, 2016
1
1
1
0
2
1
1
0
7
Cho, 2015
1
1
1
1
2
1
1
1
9
Shi, 2016
1
1
1
1
2
0
1
0
7
Sun, 2020
1
1
1
1
2
1
1
0
8
Wang, 2014
1
1
1
1
2
1
1
0
8
Yang, 2015
1
1
1
0
2
0
1
0
6
Yong, 2018
1
1
1
0
2
1
1
1
8
Yun, 2016
1
1
1
0
2
0
1
0
6
Zhang, 2016
1
1
1
1
2
1
0
0
7
A, case determination being appropriate; B, case representation; C, selection of control; D, determination of control; E, determination of exposure factors; F, determination of case and control exposure factors being the same; G, response rate.
