Fig. 2.

Nomogram to calculate risk score and predict 30-day survival probability in AECOPD patients. Scores were assigned for age, PO₂, NLR level, PNI level, treatment of IMV and vasopressor by drawing a line upward from the corresponding values to the ‘score’ line. The sum of all these scores, plotted on the ‘Total score’ line, corresponds to predictions of 30-day survival probability. IMV invasive mechanical ventilation, NLR, neutrophil-to-lymphocyte ratio; PNI prognostic nutritional index; PO₂ partial pressure of oxygen