Enrollment.

<p>Enrollment of surgical procedures into the analysis.</p

Nonlinear covariate effects.

<p>Estimated nonlinear effects of anesthesia duration (A), intravenous sufentanil (B), remifentanil TCI total dosage (C), piritramide intravenous (D) and propofol infusion maximum rate (E). The solid black line visualizes the estimated effect (measured on log OR scale), the grey region corresponds to the 95% pointwise confidence interval for the estimated effect. The marks along the x-axis indicate the observed covariate values in the data.</p

Apfel scores.

<p>Relative frequency of patients with Apfel scores 0–4 in the haloperidol group and in the non-haloperidol group.</p