Don't use the flawed fixed ratio to diagnosis COPD.
Enright
Paul L
PL
Ruppel
Gregg L
GL
D005541:Forced Expiratory Volume; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000145:classification / Q000175:diagnosis* / Q000628:therapy; D012907:Smoking / Q000009:adverse effects; D014797:Vital Capacity