Table 2.
Quality assessment of the included studies using Cochrane risk of bias tool.
| Frist author; Publish time | Bias arising from the randomization process | Bias due to deviations from intended interventions | Bias due to missing outcome data | Bias in measurement of the outcome | Bias in selection of the reported result | Over-all bias |
|---|---|---|---|---|---|---|
| Chen L. 2021 | fx1 | fx2 | fx1 | fx1 | fx1 | fx2 |
| Gao R. 2021 | fx1 | fx2 | fx1 | fx1 | fx1 | fx2 |
| Huang X. 2020 | fx1 | fx2 | fx1 | fx1 | fx1 | fx2 |
| Chen L. 2019 | fx1 | fx2 | fx1 | fx1 | fx1 | fx2 |
| Sun ML. 2023 and to be published | fx1 | fx2 | fx1 | fx1 | fx1 | fx2 |
| Sun ML. 2021a, 2021b | fx1 | fx2 | fx1 | fx1 | fx1 | fx2 |
| Urban LE. 2018 | fx1 | fx2 | fx1 | fx1 | fx1 | fx2 |
| Sambol NC. 1996 | fx1 | fx2 | fx1 | fx1 | fx1 | fx2 |
Notes: Low Risk of bias fx1; Some Concerns fx2.