Table 3.

Univariate and multivariate Cox proportional hazards model estimates of risk factors for mortality

Variable	Univariate analysis			Multivariate analysis
	HR	95% CI	P	HR	95% CI	P
Postoperative PAH
NYHA-FC III-IV	6.62	2.20-19.73	0.001	6.16	2.03-18.66	0.001
Room air SpO2 ≥ 95%	0.31	0.07-1.40	0.126	0.44	0.09-2.08	0.297
Idiopathic PAH
Age < 18 y	3.84	1.36-10.82	0.011	6.90	4.19-15.56	0.040
Female	0.51	0.28-0.94	0.03
RAP < 14 mm Hg	0.31	0.09-1.11	0.07

Univariate analysis P values < 0.2 are listed. P values < 0.05 are in bold.

CI, confidence interval; HR, hazard ratio; NYHA-FC, New York Heart Association functional class; PAH, pulmonary arterial hypertension; RAP, right atrial pressure; SpO₂, percutaneous oxygen saturation.