Age, sex, ethnicity, SBP, DBP, LDL, HDL, TG, statin use, DM, BMI, smoking status, eGFR, hemoglobin, hepatitis C infection, atrial fibrillation, viral load, CD4 count, antiretroviral therapy, alcohol use, cocaine use, and antidepressant medication use. The gene discussed is CD4; the disease is hepatitis C virus infection.