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Box 1 Original regression model to predict the risk of severe acute postoperative pain for inpatients and outpatients, where −0.42 is the intercept, and the other numbers are the regression coefficients (β) of each predictor or interaction term. Female gender, types of surgery, expected incision size ≥10 cm, and ambulatory surgery equal 1, if true, and 0, otherwise. Separate regression coefficients (β) for gender and type of surgery were estimated for inpatients and outpatients, as the effect of these predictors differed across in- and outpatients (interaction terms)

From: A simple method to adjust clinical prediction models to local circumstancesUne méthode simple pour ajuster les modèles de prédiction clinique aux circonstances locales