| Study | 1.Randomisation | 2.Deviations from intervention | 3.Missing outcome data | 4.Measurement of the outcome | 5.Selection of the reported results | Overall risk of bias |
| Hermine 2020 | Low | Some concerns1 | Low | Some concerns2 | Low | Some concerns |
| Rosas 2021 | Low | Low | Low | Low | Low | Low |
| Salama 2020 | Low | Low | Low | Low | Low | Low |
| Salvarani 2020 | Low | Some concerns3 | Low | Some concerns4 | Some concerns5 | Some concerns |
| Stone 2020 | Low | Low | Low | Low | Low | Low |
| Horby 2021 | Low | Low | Low | Some concerns6 | Low | Some concerns |
| Veiga 2021 | Low | Some concerns7 | Low | Some concerns8 | Low | Some concerns |
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