Comparison of video laryngoscopy with direct laryngoscopy in critically ill patients: a systematic review and meta-analysis of randomized controlled trials

Table 3 The results of meta-regression analysis of unadjusted model

Factor	Tau²	Estimate	95%CI	p
Site-prehospital	0.02	− 0.37	− 0.53 ~ − 0.21	< 0.001
Study time	0.02	0.03	0.01 ~ 0.05	< 0.001
Difficult airway-Main	0.03	0.18	− 0.20 ~ 0.56	0.347
Cardiac arrest-Main	0.02	− 0.21	− 0.38 ~ − 0.05	0.009
Operator proficiency for intubation-Unexperienced	0.02	0.13	− 0.03 ~ 0.29	0.102
Operator proficiency for VL -Unexperienced	0.03	− 0.18	− 0.39 ~ 0.03	0.084
Operator proficiency was higher for DL than for VL	0.01	− 0.52	− 0.69 ~ − 0.35	< 0.001

ISSN: 2047-783X