Fig. 2

The scatter plot of mRSS and the result of pulmonary function test. On the baseline, a %FVC and b %DLco negatively correlate with mRSS (correlation coefficient [r] = − 0.27, P < 0.001 and r = − 0.29, P < 0.001, respectively). In addition, the longitudinal analysis showed negative correlation of ΔmRSS with c Δ%FVC and d Δ%DLco (r = − 0.25, P = 0.03 and r = − 0.48, P < 0.001, respectively)