Fig. 4From: Identification of lipid biomarker from serum in patients with chronic obstructive pulmonary diseaseRepresentative lipid ratio PI (38:4)/C16:1 CE with FEV1%, Pack-Years, and Age. a. The lipid ratio could distinguish COPD patients and healthy people; The lipid ratio of PI (38:4)/C16:1 CE was not related to either smoking status (b) or the age of the patients (c)Back to article page