Change of forced expiratory volume in one second (FEV1) and forced vital capacity (FVC) during the study in a subgroup of 35 children aged ≥11 yrs
Data are presented as mean±sd unless otherwise stated
Z: using reference equation described in Zapletal et al. 9
K: using reference equation described in Knudson et al. 8
Q: using reference equation described in Quanjer et al. 4
W: using reference equation described in Wang et al. 6