ALB and atrial fibrillation: Candidate features (p = 82) included demographic variables, such as age, sex, race/ethnicity, smoking status, body mass index (BMI); common chronic disease history such as diabetes, dementia, chronic kidney diseases (CKD); Myocardial Infarction (MI) & Atrial Fibrillation (AF); and routinely collected laboratory markers, such as lipid panels, blood panels, albumin, creatinine, aspartate aminotransferase (AST) etc. obtained from patients routine ambulatory histories before their COVID-19 infections.