Nordstrom 1997.

Methods	Double‐blind randomised trial. 2 sets of ampoules prepared and numbered according to computer‐generated schedule. Contents unknown to women or caregivers.
Participants	Hospital in Sweden. Singleton cephalic vaginal deliveries.
Interventions	1 mL IV after delivery of baby of either: 1) 10 IU oxytocin (n = 513) 2) saline (n = 487) Passive (expectant) management of the placenta. Blood loss was calculated by measuring collected blood and adding what was estimated to have been absorbed by surgical cloths and tissues.
Outcomes	Blood loss; additional uterotonics (methylergometrine), Hb, blood transfusion; manual placental removal.
Notes	Dates of study: 16 December 1993 to 6 October 1994 Funding sources: Quote: “This study was supported by grants from the County Council and County Health Authority Research and Development Foundation in the County of Jämtland, Sweden.” Declarations of interest: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	2 sets of ampoules prepared and numbered according to computer‐generated schedule.
Allocation concealment (selection bias)	Low risk	No difference in appearance of ampoules, prepared by pharmacy.
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Intervention unknown to women and caregivers.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Intervention unknown to outcome assessors.
Incomplete outcome data (attrition bias) All outcomes	Low risk	No significant attrition.
Selective reporting (reporting bias)	Unclear risk	All outcomes reported but protocol unseen
Other bias	Unclear risk	Unclear.