Table 4.

Proportional‐Hazards Model for the Composite End Point Analysis

Variable	Hazard Ratio	95% CI	P Value
Low nNO	2.75	1.01–7.47	0.048
Ventricular dysfunction
Low‐normal	0.67	0.2–2.27	0.522
Mild	0.33	0.07–1.6	0.169
Moderate	2.13	0.55–8.19	0.273
Severe	2.01	0.25–16.29	0.514
Spo 2 <90%	1.63	0.63–4.22	0.317

N=95. Overall model: P=0.098. Harrell C: 0.677. CI indicates confidence interval; nNO, nasal NO; and Spo ₂, oxygen saturation.