Use of serum KL-6 and chest radiographic severity grade to predict 28-day mortality in COVID-19 patients with pneumonia: a retrospective cohort study

Table 2 Univariate cox regression for 28-day mortality in hospitalization in the development group

Variables	HR	95%CI	p value
Disease severity (severe/critical)	12.128	2.864–51.347	0.001
Serum KL-6 concentration, U/ml	1.002	1.001–1.003	< 0.001
P/F ratio	0.986	0.981–0.990	< 0.001
NLR	1.029	1.016–1.041	< 0.001
IL-6, pg/ml	1.001	1.001–1.002	< 0.001
RSG	3.200	2.066–4.955	< 0.001

Abbreviation HR hazard ratio, CI confidence index, KL-6 Krebs von den Lungen-6, P/F ratio artery PO2 divided by the fraction of inspired oxygen, NLR neutrophil lymphocyte ratio, IL-6 serum interleukin 6 concentration, RSG Radiological severity grade

ISSN: 1471-2466