Fig. 1
From: Pulmonary function testing in preoperative high-risk patients
Study inclusion flow chart. Legend: *Prior lung function testing less than 3 months ago n = 25, canceled operative procedure n = 27, patient consulting the anesthesia out-patient clinic for the second time within the study period n = 23, anesthesia consultation not held in out-patient clinic n = 13, time shortage n = 86, missing devices for the spirometer n = 30