Table 3.

Risk factors for AE by logistic regression analysis in patients with IPF.

Clinical Variables	Univariate Logistic Analysis			Multivariate Logistic Analysis
	HR	95.0% CI	p-value	HR	95.0% CI	p-value
Prior corticosteroid use	3.673	1.605-8.404	0.002	5.236	0.799-34.326	0.084
PaO2/FiO2 (<300)	0.011	0.003-0.043	<0.001	0.021	0.004-0.106	<0.001
GAP stage (I/II/III)	5.227	1.771-15.422	0.003	2.435	0.798-7.542	0.117
Serum GDF-15 (>989.3 pg/ml)	0.246	0.110-0.553	0.001	0.148	0.024-0.914	0.040