Study	Reason for exclusion
Abraham‐Nording 2012	This study does not evaluate postoperative nausea and vomiting.
Alnema 2011	This publication is not a randomized controlled trial.
Apfel 2012	This publication is not a randomized controlled trial.
Brandstrup 2003	This study does not evaluate postoperative nausea and vomiting
Cuthbertson 2011	This study does not evaluate postoperative nausea and vomiting.
Dabubondoc 2013	This study does not use supplemental IV fluids as an intervention.
Gaiser 2002	This study does not include participants having a surgical procedure performed under general anaesthesia or monitored anaesthetic care.
Heidari 2011	This study does not use supplemental IV crystalloids as an intervention.
Holte 2007a	This study does not evaluate postoperative nausea and vomiting.
Holte 2007b	This study does not evaluate postoperative nausea and vomiting.
Lei 2017	This publication is not a randomized controlled trial.
Mintz 2004	This publication is not a randomized controlled trial.
Yavuz 2014	This publication is not a randomized controlled trial.

IV: intravenous