Table 2.
Quality assessment of included studies by Newcastle-Ottawa scale
| Study | Selection | Comparability | Outcome | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Representative of the exposed cohort | Selection of external control | Ascertainment of exposure | Outcome of interest not present | Main factor | Additional factor | Assessment of outcome | Sufficient follow up time | Adequacy of follow up time | Total scores | |
| Htoo et al., 2016 [33] | * | 0 | * | 0 | * | 0 | * | * | * | 6/9 |
| Wang et al., 2024 [38] | * | * | * | 0 | * | 0 | * | 0 | 0 | 5/9 |
| Wang et al., 2022 [34] | * | * | 0 | * | * | * | * | 0 | * | 7/9 |
| Wang et al., 2024 [23] | * | * | 0 | * | * | 0 | * | 0 | 0 | 5/9 |
| Hsieh et al., 2024 [35] | * | 0 | * | 0 | * | * | * | * | * | 7/9 |
| Sun et al., 2024 [37] | * | * | * | 0 | * | 0 | * | 0 | 0 | 5/9 |
| Abrahami et al., 2018 [36] | * | * | 0 | * | * | * | * | 8 | * | 8/9 |