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Table 2 Results of meta-analysis for secondary outcomes between direct laryngoscopy and video laryngoscopy

From: Video laryngoscopy does not improve the intubation outcomes in emergency and critical patients – a systematic review and meta-analysis of randomized controlled trials

Outcomes Studies (n) Participants (n) Heterogeneity Heterogeneity statistical method Effect estimate (P value)
Overall success rate 8 1292 P < 0.01; I 2 = 97% Risk ratio (M-H, random, 95% CI) 0.86 [0.67–1.09] (P < 0.01)
Overall success rate (prehospital) 3 647 P = 0.04; I 2 = 69% Risk ratio (M-H, random, 95% CI) 0.58 [0.48–0.69] (P < 0.01)
Overall success rate (in-hospital) 5 645 P = 0.008; I 2 = 71% Risk ratio (M-H, random, 95% CI) 0.86 [0.67–1.09] (P = 0.03)
Duration of intubation 10 2173 P < 0.01; I 2 = 88% WMD (IV, random, 95% CI) -2.12[-13.41-9.18] (P = 0.71)
Esophageal intubation rate 6 1245 P = 0.72; I 2 = 0% Risk ratio (nonevent) (M-H, random, 95% CI) 0.36 [0.16–0.80] (P = 0.01)
In-hospital mortality 6 1494 P = 0.89; I 2 = 0% Risk ratio (nonevent) (M-H, random, 95% CI) 1.12 [0.86–1.45] (P = 0.39)
Aspiration rate 6 1588 P = 0.007; I 2 = 69% Risk ratio (nonevent) (M-H, random, 95% CI) 1.01 [0.98–1.03] (P = 0.52)
Severe low oxygen saturation rate 4 664 P = 0.07; I 2 = 57% Risk ratio (M-H, random, 95% CI) 1.43 [0.51–3.96] (P = 0.50)
Proportion of C&L grade 1 classification 4 690 P < 0.01; I 2 = 20% Risk ratio (M-H, fixed, 95% CI) 1.54 [1.37–1.74] (P < 0.01)
  1. Abbreviations: C&L Cormack and Lehane, IV Inverse variation, M-H Mantel-Haenszel, WMD Weighted mean difference