Parker 2013.

Methods	Randomised clinical trial
Participants	Participants 60 years of age or older with hip fracture and whose postoperative haemoglobin level on postoperative days 1 or 2 was between 8.0 g/dL to 9.5 g/dL Liberal: n = 100; mean age (range) = 84.4 (60 to 104) years Symptomatic: n = 100; mean age (range) = 84.2 (60 to 97) years
Interventions	Liberal transfusion maintained haemoglobin > 10.0 g/dL, or the symptomatic group received transfusion for symptoms of anaemia. These included recurrent vaso‐vagal episodes on mobilisation, chest pain of cardiac origin, congestive cardiac failure, unexplained tachycardia, hypotension or dyspnoea that was felt to be due to anaemia, decreased urine output that is unresponsive to fluid replacement, or symptoms felt appropriate by the medical staff.
Outcomes	Mobility, mental agility, physical status using the American Society of Anesthesiologists grade
Notes	‐
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	The random sequence generation was not documented.
Allocation concealment (selection bias)	Low risk	The trial used opaque numbered envelopes.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Blinding of participants and personnel was not addressed.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Blinding of outcome assessment was not addressed.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	The mobility score was missing for 94 of 200 participants.
Selective reporting (reporting bias)	Low risk	No reporting bias was apparent.
Other bias	Low risk	No other biases were apparent.