Figure 5

Relationship between sweat tests and CFTR function estimated by nasal potential difference. (A) Based on previously reported values from the literature, sweat chloride and β-adrenergic Sweat Rate are plotted against percent CFTR function as measured by nasal potential difference (NPD). (B) Sweat chloride and evaporimetry data represented as percent normal sweat test from this study for COPD smokers (∇) and COPD former smokers (Δ) are interpolated and plotted on each curve. CF-PI = pancreatic insufficient CF; CF-PS = pancreatic sufficient CF [12, 14].