Table 3.

Logistic Regression

	OR	2.5 %	97.5 %
(Intercept)	3.724	3.478	3.988
Age	1.005	1.004	1.006
Female	0.979	0.953	1.005
Medicare	0.639	0.616	0.662
Medicaid	0.628	0.604	0.652
Self-insured	1.073	0.955	1.205
Median income	1.000	1.000	1.000
Population	1.000	1.000	1.000
Dexamethasone	3.418	3.348	3.490
Droperidol	4.653	4.095	5.303
Phenergan	2.060	0.547	8.522
Case duration	0.999	0.999	0.999

Table 3 presents the results of our classical (frequentist) logistic regression, with OR (odds ratios with the coresponding 95% confidence intervals), indicating that medicaid or medicare (compared to commercially insured) patients, are less likely to receive ondansetron as antiemetic prophylaxis after controlling for potential confounders (gender, age, median income in patients’ home zip code, case duration) in this NACOR data Regression subset with complete information on antiemetic use, insurance status and all additional predictors (n = 115750, p<0.01), reported. Income is in $1000, population in 1000 souls and case duration in 10 min.