Study outcomes (n=224)
| Outcome measure | Frequency (%) |
|---|---|
| Adverse events | |
| None | 164 (73.2) |
| Major | |
| Respiratory distress | 1 (0.4) |
| Hypoxia | 0 |
| Minor | |
| Vomiting | 19 (8.5) |
| Mask intolerance | 38 (17.0) |
| Dysphoria | 2 (0.9) |
| Maximum concentration of nitrous oxide (N 2 O as %) | |
| 50% | 67 (29.9) |
| 60% | 88 (39.2) |
| 70% | 69 (30.8) |
| mean 60.2% | |
| (95% CI 59.1 to 61.2) | |
| median 60% | |