Table 3.

Univariate Logistic Analysis of the Risk for Lowering BI Score More than 15 Points 4 Weeks after AE-IPF.

	OR (95%CI)	p value
Age	1.04 (0.92-1.18)	1.040
Minimum PaO2/FiO2 ratio	1.01 (0.99-1.03)	0.079
Respiratory failure
On exertion	24.20 (2.42-242.31)	0.009**
At rest	21.00 (2.05-215.18)	0.010*
Before AE-IPF	5.00 (0.45-55.63)	0.190
LDH	0.99 (0.98-1.00)	0.139

*p<0.05, **p<0.01.

Hypoxemia was defined as an SpO₂ value <90%. Hypoxemia at exertion and at rest was assessed using a 6-minute walk test on day 29 after AE-IPF. All patients with hypoxemia before AE-IPF had an SpO₂ value<90% at rest.

AE: acute exacerbation, IPF: idiopathic pulmonary fibrosis, LDH: lactate dehydrogenase