Weiss 1995.

Study characteristics
Methods	RCT
Participants	74 women undergoing spinal anaesthesia for CS.
Interventions	Intervention: sedative (Comparison 6) Propofol 15 mg bolus after delivery of placenta. N = no information. Comparison: placebo Intralipid. N = no information.
Outcomes	Nausea/pruritis scales at various postoperative times.
Notes	Setting: Long Island Jewish Medical Centre, New York, USA. Dates: not reported. Funding source: not reported. Declaration of interest: not reported. This study currently provides no data for the review because the data are presented only in graphical form. We wrote to the authors in 2009 to request the specific data. Conference abstract.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not described.
Allocation concealment (selection bias)	Unclear risk	Not described.
Blinding of participants and personnel (performance bias) All outcomes	Low risk	All investigators blinded. Treatment identical in appearance to placebo.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	All investigators blinded.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Not described.
Selective reporting (reporting bias)	Unclear risk	We did not assess the trial protocol.
Other bias	Low risk	Nil apparent