SAH volumes 1 year before and during the COVID-19 pandemic
| Overall volume | Monthly volume | |||||||||
| N | n1 | n2 | Relative (%) change | P value | N | 1 year before | During COVID-19 | Difference* (95% CI) | P value | |
| % (95% CI) | Median (IQR) | |||||||||
| SAH | 75 | 1088 | 900 | −17.3 (−19.6 to −15.2) | <0.0001 | 75 | 3.0 (2.0–6.3) | 2.7 (1.3–5.7) | −0.33 (−1.0 to 0.0) | 0.001 |
| Coil embolisation† | 83 | 719 | 652 | −9.3 (−11.7 to −7.4) | 0.071 | 85 | 1.7 (0.67–3.7) | 1.3 (0.67–2.7) | 0.0 (−0.33 to 0.0) | 0.197 |
n1 and 1 year before are based on 3-month data 1 year before the pandemic (March 2019–May 2019). n2 and during COVID-19 are based on data from March 2020 to May 2020.
P value is from Poisson means test (overall volume analysis) and Wilcoxon signed-rank test (monthly volume analysis).
*Difference denotes the median difference between the two time periods.
†85 centres contributed 728 and 655 patients to 1 year before and during the COVID-19 period in the monthly volume analysis.
n, number of admissions/procedures; N, number of hospitals; SAH, subarachnoid haemorrhage.