What do systematic reviews say?

Transfusion of RBCs of shorter vs standard practice storage duration

Transfusion of RBCs of shorter showed no clear difference in mortality: short‐term mortality (up to 30 days) ‐ adults compared with standard practice storage duration (moderate certainty).

• Transfusion of red blood cells stored for shorter versus longer duration for all conditions 2018 · Cochrane Headline outcomes only
  RR 1.04 [0.96, 1.13]
  4 studies · 7510 participants
  Moderate

Intervention not reported

• Effect of longer‐term modest salt reduction on blood pressure 2013 · Cochrane Headline outcomes only
  no estimate extracted
  3206 participants
  High

Intervention not reported

• Effect of longer‐term modest salt reduction on blood pressure 2013 · Cochrane Headline outcomes only
  no estimate extracted
  3230 participants
  High