Fig. 1

Diffusion capacity testing (DCT) for all patients and for subgroups. (A) DLCO, (B) DLCO/VA, (C) DLNO and (D) DLNO/VA for all patients (n = 371) and subgroups. Box plots with median and min to max, ** = p < 0.01 and *** = p < 0.001 for comparison to ‘no findings’.