Study (year) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Raw score (%) | Risk of bias |
| N/A | 1 | N/A | 1 | N/A | N/A | N/A | 1 | 0.5 | 1 | 4.5/10 (45) | High |
| N/A | N/A | N/A | 1 | N/A | 1 | 1 | 1 | 1 | 1 | 6/10 (60) | Moderate |
| 0.5 | 0.5 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 6/10 (60) | Moderate |
| 1 | 1 | 1 | 1 | 1 | N/A | N/A | 1 | 0.5 | 1 | 7.5/10 (75) | Low |
| 1 | 0 | 0.5 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8.5/10 (85) | Low |
| N/A | N/A | N/A | 1 | N/A | 0 | 0 | 1 | 1 | 1 | 4/10 (40) | High |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 10/10 (100) | Low |
Mean | 8/10 (80) |