Table 2.
Modified Jadad scale.
| Author | Year | random sequence generation (selection bias) |
allocation concealment (selection bias) |
blinding of the participants and personnel (performance bias ) |
blinding of outcome assessment (detection bias) |
missing data reporting (attrition bias) |
selective reporting (reporting bias) | other bias |
|---|---|---|---|---|---|---|---|---|
| Morelli7 | 2005 | 1 | 1 | 2 | 2 | 2 | 1 | 2 |
| Morelli14 | 2010 | 1 | 1 | 2 | 2 | 2 | 1 | 2 |
| Fang15 | 2014 | 2 | 0 | 0 | 1 | 2 | 1 | 2 |
| Meng16 | 2016 | 2 | 1 | 1 | 1 | 2 | 1 | 2 |
| Hajjej17 | 2017 | 1 | 1 | 2 | 2 | 2 | 1 | 2 |
| Xu18 | 2018 | 2 | 1 | 0 | 0 | 2 | 1 | 1 |
Low risk = 2, unclear risk = 1, high risk = 0.