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Table 1 Study selection criteria

From: Red blood cell transfusion and mortality effect in aneurysmal subarachnoid hemorrhage: a systematic review and meta-analysis protocol

Inclusion criteria Exclusion criteria
1. Study design: interventional or observational 1. Studies of exclusively pediatric population (age <18 years)
2. Included population: hospitalized aSAH patients 2. Non-human studies
3. Included intervention: RBC transfusion 3. Duplicates or ‘sub-cohorts’ of previously published cohorts
4. Comparator: a different transfusion threshold or no transfusion  
5. Study outcome: any