Storage duration of RBC units and survival to hospital discharge according to study group. (A) Storage duration of RBC units by study group. The blue line indicates the distribution of storage durations for RBC units transfused in participants who were randomly assigned to receive fresher RBC units, and the red line indicates the distribution of storage durations for RBC units transfused in participants assigned to receive older RBC units. (B) Patients who survived to hospital discharge and were discharged alive during the first 28 days after randomization. Patients were censored at day 28 after randomization.