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Lung clearance index versus forced expiratory volume in 1 second (FEV1) z-score, stratified by disease status (primary ciliary dyskinesia, cystic fibrosis, healthy control). The lung clearance index did not correlate with FEV1 (PCD, R = −0.24; P = 0.36; CF, R = −0.27, P = 0.11; and HC, R = −0.08; P = 0.57). CF = cystic fibrosis; HC = healthy control; LCI = lung clearance index; PCD = primary ciliary dyskinesia.
