Characteristics of the included patients, according to the timing of admission
| Hospitalised before symptom onset | Hospitalised after symptom onset | All patients | |
| Median age | 79 years | 64 years | 68 years |
| Male sex | 52% | 62% | 61% |
| White ethnicity | 63% | 57% | 59% |
| Asian ethnicity | 3% | 7% | 7% |
| Black ethnicity | 1% | 2% | 2% |
| Number of comorbidities | 1.0/patient | 1.2/patient | 1.0/patient |