Table 6.

Predicting factors for survival in patients with IPF assessed using a multivariate Cox hazard model including diagnosis of IP-hAF.

Variable	HR (95% CI)	p value
DLco	0.985 (0.970–0.999)	0.043
Reticulation	2.453 (1.656–3.631)	< 0.001
Honeycombing	1.767 (1.242–2.515)	0.002
UIP pattern on HRCT	1.966 (1.088–3.552)	0.025
IP-hAF group	0.522 (0.307–0.886)	0.016

IPF, idiopathic pulmonary fibrosis; HR, hazard ratio; CI, confidential interval; DLco, diffusing capacity of the lung for carbon monoxide; UIP, usual interstitial pneumonia; HRCT, high-resolution computed tomography; IP-hAF, interstitial pneumonia with histologic autoimmune features.

Total lung capacity (r = 0.877; p < 0.001) was not included in the Cox proportional hazard model because of its high correlation with forced vital capacity (FVC).