Fig. 2

Changes of FVC (%) and FVC (L) between initiations of first-line antifibrotic therapy and initiations of second-line antifibrotic therapy. Changes in FVC (%) (A) and FVC (L) (B) between initiations of first-line and those of second-line antifibrotic therapy. X axis represents months between initiations of first-line and those of second-line antifibrotic therapy. Y axis shows relative (A) and absolute (B) declines of FVC between initiations of first-line and those of second-line antifibrotic therapy. Each bar depicts a single patient. Two patients were not examined spirometry at initiations of second-line antifibrotic therapy