For multivariable logistic regression, variables initially entered included age >70 years, race, BMI, CWIC, insurance type, hospital admission source, lymphocytopenia on admission, thrombocytopenia on admission, total protein on admission, albumin on admission, AST > 40U/L, CRP, serum creatinine on admission, and qSOFA score on admission. Here, CRP is linked to lymphopenia.