What do systematic reviews say?

High initial concentration vs low initial concentration

High initial concentration showed no clear difference in laryngospasm compared with low initial concentration (low certainty).

• High initial concentration versus low initial concentration sevoflurane for inhalational induction of anaesthesia 2016 · Cochrane Headline outcomes only
  OR 1.59 [0.16, 15.92]
  7 studies · 588 participants
  Low