The Age of BLood Evaluation (ABLE) randomised controlled trial: description of the UK-funded arm of the international trial, the UK cost–utility analysis and secondary analyses exploring factors associated with health-related quality of life and health-care costs during the 12-month follow-up.

Transfusing critically ill patients with blood stored for fewer than 7 days rather than blood stored for up to 35 days conferred no clinical or economic benefit.

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