ALB and chronic kidney disease: Only 14 of the 34 features were eventually chosen for modeling (Fig. 2b), among which 8 features had a positive association with mortality (high risk: consciousness, male sex, sputum, blood urea nitrogen [BUN], respiratory rate [RR], D—dimer, number of comorbidities, and age) and 6 features were negatively correlated with mortality (low risk: platelet count [PLT], fever, albumin [ALB], SpO2, lymphocyte, and chronic kidney disease [CKD]).