First author | Selectiona | Comparabilityb | Exposurec | Score |
---|
| 1 | 2 | 3 | 4 | | A | B | C | |
Cen [16] | ☆ | ☆ | - | ☆ | ☆ | ☆ | ☆ | ☆ | 7 |
Fedchuk [11] | ☆ | ☆ | - | - | ☆ | ☆ | ☆ | ☆ | 6 |
Fu [14] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | 8 |
Keskinler [18] | ☆ | ☆ | - | ☆ | ☆☆ | ☆ | ☆ | ☆ | 8 |
Li [12] | ☆ | ☆ | - | ☆ | ☆☆ | ☆ | ☆ | ☆ | 8 |
Lin [17] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | 8 |
Musso [10] | ☆ | ☆ | - | - | ☆ | ☆ | ☆ | ☆ | 6 |
Ortega [15] | ☆ | ☆ | - | - | ☆ | ☆ | ☆ | ☆ | 6 |
Vassilatou [13] | ☆ | ☆ | - | ☆ | ☆ | ☆ | ☆ | ☆ | 7 |
- Rank by the beginning letter of the first authors
- a1: Is the case definition adequate? 2: Representativeness of the cases. 3: Selection of Controls. 4: Definition of Controls
- bComparability: Comparability of cases and controls on the basis of the design or analysis. A maximum of two stars can be given for Comparability
- cA: Ascertainment of exposure. B: Same method of ascertainment for cases and controls. C: Nonresponse rate