Table 2.
Study quality evaluation via the Newcastle-Ottawa Scale
| Study | Adequate definition of cases | Representativeness of cases | Selection of controls | Definition of controls | Control for age and sex | Control for other confounders | Exposure ascertainment | Same methods for events ascertainment | Non-response rates | Total |
|---|---|---|---|---|---|---|---|---|---|---|
| Fasano 2013 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
| Gravina 2015a | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
| Gravina 2015b | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
| Del Zompo 2016 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 8 |
| Enko 2017 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
| Mujeeb 2019 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
| Radionova 2020a | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
| Radionova 2020b | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
| Kim 2022 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
| Zhu 2022 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |