The final model to predict the incidence of DVT after thoracoscopic LC excision (1 day after surgery) was as follows: Logit(P) = 9.378 – 0.061(R-value) – 0.109(K value) + 0.374(α angle) + 0.403(MA) + 0.298(FIB) + 0.406(D-D) + 0.190(MDA) − 0.097(CD4+/CD8+). Here, CD4 is linked to laryngotracheoesophageal cleft.