Figure 3From: Comprehensive characterisation of pulmonary and serum surfactant protein D in COPDCorrelation of lung function measurements and SP-D levels. Correlation of SP-D levels in BAL (A), serum (B) or the ratio of SP-D in BAL and serum (C) with FEV1/FVC in smokers (n = 50, young and elderly smokers and smokers with COPD). FEV1: forced expiratory volume in 1 s, FVC: forced vital capacity. Correlations were significant with p < 0.001, r = 0.62 (A); p = 0.013, r = 0.-0.35 (B) and p < 0.001, r = 0.60 (C).Back to article page