Fig. 2

The nomogram presented in the modeling group provides a visual representation of the clinical prediction model. Each variable value for a patient can be determined by locating the corresponding point on the nomogram. By drawing a vertical line from the variable score to the total score axis, the total score can be determined. From the total score, a vertical line can be drawn down to the predicted EP rate line, providing the estimated probability of ectopic pregnancy (EP) for a patient. For example, a total score of 140 on the nomogram indicates a probability of more than 10% for EP