Summary results for the stratified mixed effect Cox proportional hazards model
| Variable | Reference | HR | 95% CI |
| Age | 1.03 | 1.02 to 1.04 | |
| Hypertension | 0 | 1.72 | 1.46 to 2.01 |
| Intubated | 0 | 2.86 | 1.29 to 6.36 |
| From care home | 0 | 1.96 | 1.01 to 3.80 |
| CPAP stratified by time ≤7 days | 0.38 | 0.36 to 0.40 | |
| CPAP stratified by time >7 days | 1.72 | 1.40 to 2.12 | |
| Interaction hypertension and intubated | 0:0 | 0.23 | 0.11 to 0.45 |
CPAP, continuous positive air pressure.