Fig. 2.

ROC curve analysis of CRP (a) and CPK (b) at the first postoperative day after thoracoscopic esophagectomy. At a threshold of 9.6 x 10⁴μg/L CRP at 1POD, the optimal sensitivity and specificity were 73.9% and 65.4%, respectively, in patients developing major postoperative complications related to gastric conduit reconstruction. At a threshold of 1164 IU/L CPK at 1POD, the sensitivity and the specificity were 69.6% and 75.0%, respectively, in patients developing major postoperative complications related to gastric conduit reconstruction. ROC, receiver operating characteristic; CRP, C-reactive protein; POD, postoperative days; CPK, creatine phosphokinase. AUC, area under the ROC curve; CI, confidence interval