Moreover, CF patients with residual values of CFTR-mediated Cl− secretion had intermediate values in those parameters, namely: sweat-Cl− values (109.80±8.34 mmol/l); FEE concentrations (444.57±78.05 μg/g), age at diagnosis (19.6±3.4 yrs), SK scores (mean1 = 90; mean2 = 77±14; mean3 = 63±12; mean4 = 55±7); and FEV1 (mean1 =  n.a.; mean2 = 82±26; mean3 = 61±9; mean4 = 60±3). Here, CFTR is linked to cystic fibrosis.