Prick 2014.

Methods	Randomised controlled trial, not blinded
Participants	Postpartum haemorrhage (blood loss of ≥1000 ml or a decrease in Hb concentration of ≥1.9 g/dL, or both) and had an Hb between 4.8 g/dL and 7.9 g/dL 12 to 24 hours after delivery Liberal: n = 258; mean age (SD) = 30.7 (5.0) years Non‐intervention: n = 261; mean age (SD) = 30.9 (5.3) years
Interventions	In the liberal group, participants received at least 1 unit of red blood cells; the trialists aimed to reach an Hb concentration of at least 8.9 g/dL. In the restrictive group, participants received no transfusion.
Outcomes	Primary outcome was physical fatigue 3 days postpartum using the Multidimensional Fatigue Inventory scale
Notes	‐
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	The use of random sequence generation was not stated.
Allocation concealment (selection bias)	Low risk	The trial used a web‐based application with block randomisation of variable block size.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Participants were not blinded.
Blinding of outcome assessment (detection bias) All outcomes	High risk	The primary outcome was based on a questionnaire.
Incomplete outcome data (attrition bias) All outcomes	High risk	20% of data for the primary outcome was missing.
Selective reporting (reporting bias)	Low risk	No reporting bias was apparent.
Other bias	Low risk	No other biases were apparent.