Table 2 The Newcastle–Ottawa Scale was used to assess the quality of the included studies.
Selection | Comparability | Exposure | Total score | ||||||
|---|---|---|---|---|---|---|---|---|---|
Studies | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
B. Bhindi | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 7 | |
M. Kang | ★ | ★ | ★ | ★ | ★ | ★ | 6 | ||
S. Lee | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 7 | |
S. Mao | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
M. Miyake | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 7 | |
D. Peng | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
P. Rajwa | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
G. Zhang | ★ | ★ | ★ | ★ | ★ | ★ | 6 | ||
H. Yuk | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
A. Caglayan | ★ | ★ | ★ | ★ | ★ | ★ | 6 | ||
R. kayar | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 7 | |
C. Karan | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 7 | |
X. Wang | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
M. Avci | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
W. Zhang | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
R. Wu | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
X. Yi | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
C. Wang | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
A. Salari | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 7 | |
I. Yilmaz | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
