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Fig. 2B —Relationships with relative volume change. Excellent
correlation is observed at upper threshold value of –860 H with
pulmonary function tests that reflect peripheral airway obstruction and air
trapping. Graphs show relationships between relative volume
change860–950 and forced expiratory flow
(FEF)25–75% (r = –0.75, p < 0.001)
(A) and between relative volume change860–950 and
ratio of residual volume to total lung capacity (RV/TLC) (r = 0.70,
p < 0.001) (B).
