Gregersen 2015.

Methods	Randomised clinical trial
Participants	Participants aged 65 years or older undergoing hip fracture surgery and who had postoperative Hb levels between 9.7 g/dL and 11.3 g/dL during the first 6 postoperative days Liberal: n = 140; mean age (SD) = 88 (6.9) years Restrictive: n = 144; mean age (SD) = 86 (6.8) years
Interventions	The liberal transfusion group received transfusion when Hb was less than 11.3 g/dL, and the restrictive transfusion group received transfusion when Hg was less than 9.7 g/dL.
Outcomes	The primary outcome was recovery from physical disabilities, with 3 tools being used to measure physical performance: Modified Barthel index, New Mobility score and cumulated ambulation score, total number of infections (pneumonia, urinary tract infection, other), cognition, depression, quality of life, modified Barthels index, and comprehensive frailty index.
Notes	3 publications reported results.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Random sequence generation was not specifically stated, but it was likely since a clinical trial support system was used.
Allocation concealment (selection bias)	Low risk	A web‐based randomisation system was used.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	The participants were blinded but not the clinicians.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	The assessor was blinded.
Incomplete outcome data (attrition bias) All outcomes	Low risk	The outcome data appeared to be complete.
Selective reporting (reporting bias)	Low risk	No reporting bias was apparent.
Other bias	Low risk	No other biases were apparent.