Fig. 4.

Preoperative anxiety. (A) Incidences of State Anxiety Inventory (SAI) and Trait Anxiety Inventory (TAI) scores of 40 or higher for patients in the waiting area. No significant difference between the groups was found by the chi-squared test. (B) Relationship between partial-likelihood deviance and log(λ). The dotted line corresponds to the model of lambda.min (lambda = 0.042), which includes two variables. (C) Receiver operating characteristic curves for two statistical methods of regression (Least Absolute Shrinkage and Selection Operator [LASSO] and Stepwise Logistic [SL]). (D) Decision curve analysis for the two models. The resulting curves are very close, indicating that the models are equal in prediction efficiency. (E) Nomogram of the logistic regression model predicting an SAI score of 40 or higher.