Table 1.

Sensitivity and specificity of severity determination. First, biomarkers are added individually, followed by combinations of pairs of the top three performing biomarkers. With five features, LR outperformed RF's sensitivity; with more features, RF delivered both greater sensitivity and specificity.

no. features	features list	sensitivity	specificity
5a	RR, HR, Osat, crackles, grunting	0.85	0.68
5b	RR, HR, Osat, crackles, grunting	0.72	0.82
6b	RR, HR, Osat, crackles, grunting + CRP	0.89	0.82
6b	RR, HR, Osat, crackles, grunting + Lcn2	0.87	0.8
6b	RR, HR, Osat, crackles, grunting + Hap	0.88	0.79
6b	RR, HR, Osat, crackles, grunting + CD163	0.88	0.77
7b	RR, HR, Osat, crackles, grunting + CRP + Lcn2	0.91	0.78
7b	RR, HR, Osat, crackles, grunting + CRP + Hap	0.91	0.83
7b	RR, HR, Osat, crackles, grunting + Lcn2 + Hap	0.88	0.76

^aClassification via LR.

^bClassification via RF.