Fig. 4From: Assessment of survival in patients with idiopathic pulmonary fibrosis using quantitative HRCT indexesKaplan-Meier curves for kurtosis (a), skewness (b), MLD (c), FA% (d), HAA% (e). Cut-off points: kurtosis ≤0.76; skewness ≤1.15; Mean lung density > − 762.97; FA% > 24.26; HAA% > 14.76Back to article page