Table 3.
Results of quality assessment using the Newcastle-Ottawa Scale for case-control studies
|
Ref.
|
Selection
|
Comparability
|
Exposure
|
Scores
|
|||||
|
Adequate definition of cases
|
Representativeness of the cases
|
Selection of controls
|
Definition of controls
|
Control for important factor1
|
Ascertainment of exposure
|
Same method of ascertainment for cases and controls
|
Non-response rate
|
||
| Shakeri et al[31], 2013 | ★ | ☆ | ☆ | ★ | ★★ | ☆ | ★ | ★ | 6 |
| Zhang et al[8], 2022 | ★ | ☆ | ☆ | ★ | ★★ | ★ | ★ | ☆ | 6 |
| Zhang et al[34], 2022 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
1
A maximum of 2 stars can be allotted in this category, one for age, the other for other controlled factors.