Fig. 2From: How stable is lung function in patients with stable chronic obstructive pulmonary disease when monitored using a telehealth system? A longitudinal and home-based studyRelative density of the changes in of FEV1 (left) and IC (right) between measurements (top), between successive AM measurements (middle), and between successive PM measurements (bottom). Thin lines show individual curves. Red thick lines show the averaged density curve. FEV1: Forced Expiratory Volume in one second, IC: Inspiratory CapacityBack to article page