| 'Risk of bias' assessment of Zhang 2020b | |||
| Domain | Assessed outcomes | Authors' judgement | Support for judgement |
| Representative study group (selection bias) | Not available | High | 1 participant only |
| Outcome detectors blinded to intervention (detection bias) | Adverse events | High | Not blinded, awareness of intervention can bias assessment of subjective outcomes |
| Complete outcome assessment/follow‐up (attrition bias) | Adverse events | Low | Reported that no transfusion‐related acute lung injuries were observed |
| Well‐defined study group (reporting bias) | Not available | Unclear | Participant not described in detail |
| Well‐defined outcome (reporting bias) | Adverse events | Low | No adverse events occurred |
| Well‐defined risk estimates (analyses) | Adverse events | Not available | No analyses performed |
| Important prognostic factors or follow‐up taken adequately into account (confounding) | Not available | High | Not adjusted for confounding factors |
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