Outcomes: Dichotomous
Treatment or comparator: Nitrous oxide ‐ free ‐ A
Outcome Measure	After 48 hours		In recovery		24 hours		Overall
	n	N	n	N	n	N	n	N
Accidental awareness
Treatment or comparator: Nitrous oxide‐based ‐ A
Outcome Measure	After 48 hours		In recovery		24 hours		Overall
	n	N	n	N	n	N	n	N
Accidental awareness
Treatment or comparator: Nitrous oxide ‐free ‐ B
Outcome Measure	After 48 hours		In recovery		24 hours		Overall
	n	N	n	N	n	N	n	N
Accidental awareness
Treatment or comparator: Nitrous oxide‐based ‐ B
Outcome Measure	After 48 hours		In recovery		24 hours		Overall
	n	N	n	N	n	N	n	N
Accidental awareness