Table 3 Study quality of the diagnostic studies, as judged by the QUADAS II checklist
From: A pair-wise meta-analysis highlights circular RNAs as potential biomarkers for colorectal cancer
| Study | Risk of bias | Concerns regarding applicability | Total stars | |||||
|---|---|---|---|---|---|---|---|---|
| Patient selection | Index test | Reference standard | Flow and timing | Patient selection | Index test | Reference standard | ||
| Wang J 2018 [9] | Low | Unclear | Low | Low | Unclear | Low | Low | 5 |
| Wang F 2018 [10] | Low | Unclear | Low | Unclear | Unclear | Low | Low | 4 |
| Wang X 2015 [11] | Low | Unclear | Low | Low | Unclear | Low | Low | 5 |
| Hsiao KY 2017 [12] | Low | Unclear | Low | Unclear | Unclear | Low | Low | 4 |
| Zhang P 2017 [13] | Low | Unclear | Low | Unclear | Unclear | Low | Low | 4 |
| Li J 2018 [14] | Low | Unclear | Low | Unclear | Unclear | Low | Low | 4 |
| Ji WX 2018 [16] | Low | Unclear | Low | Unclear | Unclear | Low | Low | 4 |
| Li XN 2019 [19] | Low | Low | Low | Low | Unclear | Low | Low | 6 |
| Zhuo F 2017 [20] | Low | Low | Low | Low | Unclear | Low | Low | 6 |
