These “maximum-slope” decision points are: Fever Duration: 7.42 days; Albumin: 25.40 g/L; Hemoglobin: 113.39 g/L; Total Bilirubin: 5.65 μmol/L; BNP: 421.90 pg/mL; These values represent quantitative anchors where the risk escalates most rapidly, offering clinical guidance without imposing rigid, binary cut-offs. Here, NPPB is linked to Fever.