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Newcastle-Ottawa risk of bias assessment.
| Selection | Comparability | outcome | Score | Risk of bias | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| The exposed | The non-exposed | Ascertainment of exposure | outcome was not present in the study | Assessment of outcome | Was follow-up long enough for the outcome to occur | Complete accounting | |||||
| Lv et al., (2020) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 | Low | |
| Fang et al., (2020) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 | Low | |
| Wang et al., (2022) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 | Low | |
| Zheng and Lu. (2021) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 | Low | |
| Wang et al., (2020) | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 | Low | |
