Rates of concomitant COVID-19 and aSAH admissions
| N | COVID-19 and aSAH | aSAH overall | COVID-19 overall | Fraction of aSAH % (95% CI) | Fraction of COVID-19 % (95% CI) | |
| Overall | 42 | 60 | 2651 | 85 506 | 2.3 (1.8 to 2.9) | 0.07 (0.05 to 0.09) |
| Europe | 11 | 19 | 459 | 18 764 | 4.1 (2.7 to 6.4) | 0.10 (0.06 to 0.16) |
| North America | 19 | 36 | 862 | 45 952 | 4.2 (3.0 to 5.7) | 0.08 (0.06 to 0.11) |
| Asia | 8 | 0 | 1117 | 5983 | 0 (0 to 0.3) | 0.00 (0.00 to 0.08) |
| South America | 3 | 1 | 113 | 7676 | 0.9 (0.2 to 4.8) | 0.01 (0.00 to 0.07) |
| Africa | 1 | 4 | 100 | 7101 | 4.0 (1.6 to 9.8) | 0.06 (0.02 to 0.15) |
| Oceania | 0 | – | – | – | – |
aSAH, aneurysmal subarachnoid haemorrhage; n, number of hospitals; SAH, subarachnoid haemorrhage.