| Study ref. | Sequence generation | Allocation Concealment | Blinding | Incomplete Outcome data | Selective outcome reporting | Other sources | Comment |
| 3 | 2 | 2 | 2 | 1 | 1 | 2 | Inadequate method |
| 12 | 1 | 1 | 1 | 1 | 1 | 2 | Small sample and VAS score. |
| 13 | 1 | 1 | 1 | 1 | 1 | 1 | |
| 14 | 1 | 1 | 1 | 1 | 1 | 1 | |
| 15 | 1 | 1 | 3 | 1 | 1 | 1 | |
| 16 | 1 | 1 | 1 | 1 | 1 | 1 | |
| 17 | 2 | 1 | 3 | 1 | 1 | 1 | |
| 18 | 1 | 1 | 1 | 1 | 1 | 1 | |
| 19 | 2 | 2 | 2 | 1 | 1 | 2 | Inadequate method |
| 20 | 1 | 3 | 2 | 2 | 2 | 2 | Inadequate method |
| 22 | 2 | 2 | 3 | 1 | 1 | 2 | Inadequate method |
| 23 | 1 | 3 | 3 | 1 | 1 | 2 | |
| 24 | 2 | 2 | 3 | 1 | 1 | 2 | Inadequate method |
| 25 | 1 | 3 | 3 | 1 | 1 | 1 | |
| 26 | 1 | 3 | 1 | 1 | 1 | 1 | |
| 27 | 1 | 3 | 3 | 1 | 1 | 1 | |
| 29 | 1 | 2 | 2 | 1 | 1 | 1 | |
| 30 | 3 | 3 | 3 | 1 | 1 | 1 | |
| 31 | 1 | 2 | 3 | 1 | 1 | 1 | |
| 34 | 2 | 2 | 3 | 1 | 1 | 1 | |
| 35 | 1 | 2 | 1 | 1 | 1 | 1 | |