Subgroup | Droperidol or control | Event, n (%) | cOR (95% CI) | p | aOR (95% CI)†| p |
---|---|---|---|---|---|---|
Apfel’s score = 1 or 2 | Droperidol | 8 (7.3%) | 0.40 (0.17–0.96) | 0.0396 | 0.36 (0.15–0.89) | 0.0258 |
 | Control | 19 (16.4%) | reference |  | reference |  |
Apfel’s score = 3 or 4 | Droperidol | 59 (13.4%) | 0.51 (0.36–0.73) | 0.0002 | 0.51 (0.36–0.72) | 0.0002 |
 | Control | 101 (23.2%) | reference |  | reference |  |
Age < 65 years | Droperidol | 57 (12.5%) | 0.47 (0.33–0.67) | < 0.0001 | 0.47 (0.33–0.67) | < 0.0001 |
 | Control | 102 (23.4%) | reference |  | reference |  |
Age ≥ 65 years | Droperidol | 10 (10.3%) | 0.63 (0.27–1.43) | 0.2657 | 0.56 (0.24–1.30) | 0.1766 |
 | Control | 18 (15.5%) | reference |  | reference |  |
Male | Droperidol | 5 (5.9%) | 0.40 (0.14–1.18) | 0.0986 | 0.40 (0.14–1.18) | 0.0986 |
 | Control | 13 (13.4%) | reference |  | reference |  |
Female | Droperidol | 62 (13.3%) | 0.50 (0.35–0.70) | < 0.0001 | 0.49 (0.35–0.70) | < 0.0001 |
 | Control | 107 (23.5%) | reference |  | reference |  |
Current smoker | Droperidol | 4 (7.3%) | 0.24 (0.07–0.81) | 0.0213 | 0.29 (0.08–1.03) | 0.0558 |
 | Control | 12 (24.5%) | reference |  | reference |  |
Not a current smoker | Droperidol | 63 (12.7%) | 0.53 (0.38–0.75) | 0.0003 | 0.51 (0.37–0.72) | 0.0001 |
 | Control | 108 (21.5%) | reference |  | reference |  |
Previous PONV | Droperidol | 8 (32.0%) | 0.71 (0.22–2.25) | 0.5563 | 0.71 (0.22–2.3) | 0.5563 |
 | Control | 10 (40.0%) | reference |  | reference |  |
No previous PONV | Droperidol | 59 (11.2%) | 0.48 (0.34–0.67) | < 0.0001 | 0.47 (0.33–0.66) | < 0.0001 |
 | Control | 110 (20.9%) | reference |  | reference |  |
Neuraxial anesthesia | Droperidol | 26 (14.1%) | 0.54 (0.32–0.94) | 0.0282 | 0.54 (0.32–0.94) | 0.0286 |
 | Control | 40 (23.3%) | reference |  | reference |  |
General anesthesia | Droperidol | 41 (11.2%) | 0.48 (0.32–0.72) | 0.0004 | 0.45 (0.30–0.69) | 0.0002 |
 | Control | 79 (20.9%) | reference |  | reference |  |
Use of volatile anesthetics | Droperidol | 41 (11.1%) | 0.47 (0.31–0.71) | 0.0003 | 0.45 (0.30–0.68) | 0.0002 |
 | Control | 80 (21.1%) | reference |  | reference |  |
No use of volatile anesthetics | Droperidol | 26 (14.1%) | 0.54 (0.32–0.94) | 0.0282 | 0.54 (0.32–0.94) | 0.0286 |
 | Control | 40 (23.3%) | reference |  | reference |  |
Use of neostigmine | Droperidol | 13 (10.6%) | 0.47 (0.23–0.96) | 0.0371 | 0.49 (0.24–1.02) | 0.0569 |
 | Control | 27 (20.2%) | reference |  | reference |  |
Use of sugammadex | Droperidol | 27 (11.2%) | 0.46 (0.28–0.76) | 0.0023 | 0.42 (0.25–0.70) | 0.0009 |
 | Control | 52 (21.7%) | reference |  | reference |  |
Intraoperative use of dexamethasone | Droperidol | 39 (11.3%) | 0.49 (0.32–0.74) | 0.0008 | 0.46 (0.30–0.71) | 0.0004 |
 | Control | 74 (20.7%) | reference |  | reference |  |
No intraoperative use of dexamethasone | Droperidol | 28 (13.5%) | 0.51 (0.30–0.85) | 0.0100 | 0.51 (0.30–0.85) | 0.0101 |
 | Control | 46 (23.6%) | reference |  | reference |  |