Table 2. Quality assessment of the included studies (N = 8).
| S.N. | Author and year | Representativeness | Sample size justification | Non-response | Ascertainment of exposure | Control for confounding | Assessment of outcome | Statistical tests | Overall Quality |
|---|---|---|---|---|---|---|---|---|---|
| 1. | Ashwal 2021 | * | 0 star | 0 star | * | ** | * | * | Satisfactory |
| 2. | Guillén-Sacoto 2017 | * | * | * | * | * | * | * | Good |
| 3. | Guillén-Sacoto 2018 | * | 0 star | * | * | * | * | * | Good |
| 4. | Hiersch 2019 | * | * | 0 star | * | * | * | * | Good |
| 5. | Lai 2015 | 0 star | 0 star | 0 star | * | ** | * | * | Satisfactory |
| 6. | Sheehan 2019 | * | 0 star | 0 star | * | ** | * | * | Satisfactory |
| 7. | Weiner 2018 | * | * | * | * | * | * | * | Good |
| 8. | Xue 2019 | * | 0 star | * | * | ** | * | * | Good |