Fig. 1

Receiver operating characteristic (ROC) curve of plasma Surfactant Protein D (SP-D) for discriminating patients with ARDS (n = 38) versus patients without ARDS (n = 38). The area under the ROC curve (AUC) for SP-D was 0.71 (95% confidence intervals, 0.60–0.83). A cut-off point of 12.7 ng/mL for SP-D yielded sensitivity of 74% and specificity of 63%