Fig. 5From: Video versus direct laryngoscopy in critically ill patients: an updated systematic review and meta-analysis of randomized controlled trialsSubgroup analysis of primary outcome by operator's experience in intubating critically ill patients with VL. Abbreviations: CI, confidence interval; MH, Mantel–Haenszel; DL, direct laryngoscope; VL, video laryngoscope; RR, risk ratioBack to article page