Fig. 2

Kaplan-Meier survival curves classified by the A-DROP score and the risk score for non-elderly. The A-DROP score (range, 0–5) is obtained by summing the existence of the following characteristics: confusion, dehydration (existence of a clinical sign of dehydration or blood urea nitrogen level ≥210 mg/L), respiratory failure (SpO₂ ≤ 90 % or PaO₂ ≤ 60 mmHg), a low blood pressure (systolic blood pressure ≤90 mmHg), and age. For A-DROP, scores for age are 0 points in all patients because all are <65 years. The risk score for non-elderly (range, 0–5) is calculated by summing the existence of the following characteristics: patient requires help with feeding; the existence of malignancy (any malignancy including metastatic solid tumour); confusion; low blood pressure (systolic blood pressure ≤90 mmHg), and age 40–64 years. In both survival curves, there are significant differences for each group (P < 0.0001, all)