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Sputum eosinophil counts were negatively correlated with lung function parameters. Sputum eosinophil counts were negatively correlated with (A) FEV1 (β=-0.62, P=0.02), and (B) FEV1/FVC (β=-0.41, P=0.005) in the entire study population. Unfilled circles (○) represent individual subjects.
