1. Supplemental intravenous crystalloids for the prevention of postoperative nausea and vomiting: quantitative review 
C.C. Apfel, A. Meyer, M. Orhan-Sungur, L. Jalota, R.P. Whelan, S. Jukar-Rao 
British Journal of Anaesthesia 
Volume 108, Issue 6, Pages (June 2012)
DOI: /bja/aes138
Copyright © 2012 The Author(s) Terms and Conditions

2. Fig 1
Flow chart detailing the retrieval of included studies. RCT, randomized controlled trial.
British Journal of Anaesthesia  , DOI: ( /bja/aes138)
Copyright © 2012 The Author(s) Terms and Conditions

3. Fig 2
Total fluid administered and incidence of PON in the early period (n=1234). For each study, the percentage of patients who experienced PON is plotted with the corresponding mean amount of fluid administered to the control group and the supplemental i.v. crystalloids group. The trend line shows the change in incidence with treatment.
British Journal of Anaesthesia  , DOI: ( /bja/aes138)
Copyright © 2012 The Author(s) Terms and Conditions

4. Fig 3 Risk of bias of included studies.
British Journal of Anaesthesia  , DOI: ( /bja/aes138)
Copyright © 2012 The Author(s) Terms and Conditions