What do systematic reviews say?

Semi‐recumbent position (30º to 60º) vs supine

Semi‐recumbent position (30º to 60º) showed no clear difference in pressure ulcers compared with supine position (0° to 10°) (low certainty).

• Semi‐recumbent position versus supine position for the prevention of ventilator‐associated pneumonia in adults… 2016 · Cochrane Headline outcomes only
  RR 0.91 [0.6, 1.38]
  1 study · 221 participants
  Low