2.7. Statistical analysis
±, fistula
SPSS 22.0 software was used for statistical analysis. A random number table was used to randomly classify the patients with CD into training and validation sets. Measures approximately conforming to the normal distribution are expressed as mean ± standard deviation (R 3.5.1 and R studio were used for data analysis and nomogram plotting. A nomogram model for predicting postoperative intestinal fistula in patients with CD was constructed. Receiver operating characteristic curves were plotted to evaluate the predictive model, and the area under the curve (AUC) values were calculated. The accuracy of the model was evaluated using calibration curves, and the predictive ability of the model was validated using the validation set. Differences with 