Fig. 3From: An initial evaluation of the safety of a disposable oscillating positive expiratory pressure device in patients with chronic obstructive pulmonary disease: a short-term pilot studyLine plots of individual change between baseline and follow-up for FEV1 Litres (top left), FEV1% Predicted (bottom left), FVC Litres (top right), and FVC % Predicted (bottom right)Back to article page