Table 3.

Multivariate cox regression analysis for death in all patients (N = 538).

	HR	95% CI	P-value
High IPVD (≥2.0)	4.46	1.45–13.73	. 009
Presence of congenital anomaly syndromes relatedto PH	0.97	0.51–1.83	.925
Year of performing a lung biopsy	1.05	0.99–1.12	.135
Age at lung biopsy	0.87	0.72–1.05	.141

CI, confidence interval; IPVD, index of pulmonary vascular disease; PH, pulmonary hypertension; HR, hazard ratio.

Bold values denote statistical significance at P < 0.05.