Study Quality Assessment Using the Quality of Prognostic Studies Tool
| Authors | Study Participation | Study Attrition | Prognostic Factor Measurement | Outcome Measurement | Study Confounding | Statistical Analysis and Reporting |
|---|---|---|---|---|---|---|
| Yu et al, 2020 | M | L | L | L | L | L |
| Wang, 2020 | M | L | L | L | L | L |
| Chen, 2020 | M | H | L | L | H | L |
| Zhou, 2020 | M | L | L | L | L | L |
| Liu, 2020 | M | L | L | L | L | L |
| Liang, 2020 | M | L | L | L | L | L |
| Xie, 2020 | M | L | L | L | L | L |
| Yan, 2020 | M | H | L | L | L | L |
| Cao, 2020 | M | L | L | L | H | L |
| Hu, 2020 | M | H | L | L | L | L |
| Luo, 2020 | M | L | L | L | L | L |
| Petrilli, 2020 | M | H | L | L | L | L |
| Wu, 2020 | M | H | L | L | H | L |
| Li, 2020 | M | H | L | L | L | L |
| Jang, 2020 | M | L | L | L | L | L |
| Xu, 2020 | M | H | L | L | L | L |
| Zhou, 2020 | M | L | L | L | L | L |
| Hou, 2020 | M | L | L | L | L | L |
| Zhang, 2020 | M | H | L | L | L | L |
| Liu, 2020 | M | L | L | L | L | L |
| Zhu, 2020 | M | L | L | L | L | L |
| Hu, 2020 | M | L | L | L | L | L |
L, low risk of bias; M, moderate risk of bias; H, high risk of bias.