Table 1.

Regression Coefficients for Predictors and Intercept of the Original Prediction Model, the Updated Prediction Model, and the New Prediction Model.

Predictor	Original Model	Updated Model	Newly Developed Model
Age, y	−0.022	−0.017	−0.010
Female gender	0.46	0.36	0.63
Current smoking	−0.63	−0.50	−0.068
History of PONV or motion sickness	0.76	0.60	0.85
Lower abdominal or middle ear surgery	0.61	—	—
Abdominal or middle ear surgerya	—	0.48	0.63
Isoflurane and/or nitrous oxide anesthesiab	0.72	—	—
Inhalational anesthesiac	—	0.35	0.33
Outpatient surgery	—	−1.16	−1.14
Intercept	0.15	0.12	−0.65

PONV, postoperative nausea and vomiting.

^a.In the updated model and newly developed model, this predictor replaced “lower abdominal or middle ear surgery” from the original model. In the updated model and the newly developed model, it included lower abdominal, upper abdominal, and laparoscopic surgery in addition to middle ear surgery.

^b.As compared with intravenous anesthesia using propofol.

^c.As compared with intravenous anesthesia using propofol. In the updated model and newly developed model, this predictor replaced “isoflurane and/or nitrous oxide anesthesia” from the original model.

^d.Predictor not included in the original model.