The minimalistic predictor was based on the variables body-mass index (BMI > 24.9 kg/m2), smoking habit (smoker/former smoker), presence of acute kidney injury, dyspnea, oxygen saturation level (< 96%), body temperature (two thresholds, i.e. > 37.3 °C and > 38.9 °C), respiratory rate (two thresholds, > 16/min and > 21/min), C-reactive protein (CRP, 2 thresholds, > 29 and > 119 mg/L), creatinine (≥ ULN, upper limit of normal), LDH (≥ ULN), AST (≥ ULN), gamma-GT (≥ ULN), lymphocyte counts (≥ 3000/μL), and neutrophil counts (≥ 3000/μL). This evidence concerns the gene CRP and acute kidney injury.