CRP and sarcoidosis: Sarcoidosis patients showed the best areas under the curve (AUC) than patients with other ILDs for KL-6 (AUC = 0.82, 95%CI 0.71–0.92; p < 0.001), CRP (AUC = 0.72, 95%CI 0.57–0.86; p = 0.008) and WBC (AUC = 0.712, 95%CI 0.57–0.85 p = 0.0039) (Fig. 1a).