Table 2. Methodological quality of the involved 39 studies according to the QUADAS criteria.
| Yes (%) | No (%) | Unclear (%) | |
|---|---|---|---|
| Patient spectrum | 24 (61.54) | 8 (20.51) | 7 (17.95) |
| Selection criteria | 25 (64.10) | 10(25.64) | 4(10.26) |
| Reference standard | 39 (100) | ||
| Disease progression bias | 39 (100) | ||
| Partial verification bias | 39 (100) | ||
| Differential verification bias | 39 (100) | ||
| Incorporation bias | 39 (100) | ||
| Text details | 39 (100) | ||
| Reference standard details | 39 (100) | ||
| Text review details | 18 (46.15) | 8 (20.51) | 13 (33.33) |
| Diagnostic review bias | 18 (46.15) | 9 (23.08) | 12 (30.77) |
| Clinical review bias | 38 (97.44) | 1 (2.56) | |
| Uninterpretable results | 38 (97.44) | 1 (2.56) | |
| Withdrawals explained | 38 (97.44) | 1 (2.56) |