Fig. 3

Scatter diagram for the relationship between serum Rcn3 level and pulmonary function indexes (TLC% pred, FVC% pred and DLCO% pred) in CTD-ILD patients (A–C) and IPF patients (D–F). CTD-ILD, connective tissue disease-associated interstitial lung disease; IPF, idiopathic pulmonary fibrosis; TLC% pred, predicted total lung capacity; FVC% pred, predicted forced vital capacity; DLCO% pred, predicted lung diffusing capacity for carbon monoxide