TABLE 3

Univariate and multivariate analyses of predictors of 90-day mortality

Variables	HR (95% CI)	p-value
Univariate analysis
Pre-existing ILD	4.003 (1.761–9.098)	0.001
Steroid pulse therapy	3.135 (1.488–6.606)	0.004
Albumin	0.364 (0.214–0.621)	<0.001
KL-6	1.000 (1.000–1.001)	0.002
LDH	1.002 (1.000–1.003)	0.074
CRP	1.045 (0.992–1.101)	0.095
P_aO₂/F_IO₂ ratio	0.991 (0.987–0.996)	<0.001
Multivariate analysis
Pre-existing ILD	5.952 (1.900–18.649)	0.002
Albumin	0.312 (0.131–0.743)	0.009

HR: hazard ratio; ILD: interstitial lung disease; KL-6: Krebs von den Lungen-6; LDH: lactate dehydrogenase; CRP: C-reactive protein; P_aO₂: arterial oxygen tension; F_IO₂: inspiratory oxygen fraction.