Table 2.

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.