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Kaplan–Meier survival curves of patients with IIPs and CTD-ILD. Statistically significant difference was not observed between patients with IIPs and CTD-ILD (P = 0.084, log-rank test). However, patients with IIPs seemed to be associated with worse survival compared with those with CTD-ILD. CTD-ILD = connective tissue disease-associated interstitial lung disease, GC = glucocorticoids, IIPs = idiopathic interstitial pneumonias.
