GPT and respiratory failure: The restricted cubic spline model in Figure 2 revealed a significant relationship between PNI and 30-day (A: p for overall <0.001, p for non-linearity = 0.089) and 90-day mortality risk (B: p for overall <0.001, p for non-linearity = 0.08) after adjusted for Age, Gender, Respiratory Failure, DM, LAC, WBC, HGB, ALT, Cr, MV, PSI, Vasoactive drugs, High-dose glucocorticoid, Ganciclovir, Sulfonamide, Anti-Aspergillus, Anti-Pseudomonas.