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