Fig. 2

A, Nomogram to predict complicated appendicitis during pregnancy (Trimesters, NEUT%, and CRP). B, Calibration curve: The x-axis reflexes the predicted risk. The y-axis reflexes the actual risk of complicated appendicitis. The diagonal dotted represents a perfect prediction by an ideal model. The red and blue lines represent the performance of the nomogram, of which a closer fit to the diagonal dotted line represents a better prediction. C, Decision Curve Analysis (DCA): The vertical axis represents the value of net benefit, and the horizontal axis represents the threshold level. If the threshold probability is 0–64%, then the use of this nomogram is beneficial in clinical practice. D, Clinical Impact Curves (CIC): the red curve (Number high risk) indicates the number of individuals classified as positive (high-risk) by the model at each threshold probability; the blue curve (Number high risk with event) is the number of true positives at each threshold probability. the CIC visually indicates that the nomogram has a high net clinical benefit.