Fig. 2

Kaplan–Meier analyses of patients in the derivation group. Male sex (a), age over 65 years (b), IP (c), hypoalbuminemia (d), and cavity formation (e) were associated with a significantly poorer prognosis. Without cavity ≥ 2 cm includes patients with no cavity or cavities < 2 cm. Cases with missing data were excluded from the analysis. IP, interstitial pneumonia.