Fig. 2
K-BILD total score in (a) the lower and upper quartile of 6MWD at baseline, b the lower and upper quartile of FVC % predicted at baseline, c the lower and upper quartile of DLCO % predicted at baseline, d use of long-term oxygen therapy and e GAP index. The midlines of the boxes indicate the median values and the boundaries illustrate the 25th and 75th percentiles; the whiskers are the upper (1.5 interquartile range above 75th percentile) and lower adjacent values (1.5 interquartile range below 25th percentile). The dots are outlying values. 6MWD: Distance walked during the 6-min walk test; K-BILD: King’s Brief Interstitial Lung Disease questionnaire. FVC: Forced vital capacity; DLCO: diffusion capacity of the lung for carbon monoxide; LTOT: Long-term oxygen therapy; GAP: Gender, age, physiology. ES: Effect size (partial η2)