Table 2 Quality Assessment of Studies Using Newcastle–Ottawa Scale for Case–control Studies
Authors, year | Selection | Comparability of cases and controls (matched for) | Exposure | Total score | |||||
|---|---|---|---|---|---|---|---|---|---|
Adequate definition of cases | Representativeness of cases | Selection of controls | Definition of controls | Ascertainment of exposure | Same method of ascertainment for cases and controls | Non-response rate | |||
Baylan, F. A., [19] | * | * | – | * | ** | * | * | – | 7 |
Du, C., [20] | * | * | * | * | ** | * | * | – | 8 |
Cataldo, L. R., [22] | * | * | – | * | ** | * | * | * | 8 |
Jiang Fen, [23] | * | * | – | * | ** | – | * | – | 6 |
Wojciechowska M, [24] | * | * | * | * | ** | * | * | – | 8 |
Wang Xiaogang, [25] | * | * | – | * | ** | * | * | – | 7 |