Fig. 5From: Early intubation and clinical outcomes in patients with severe COVID-19: a systematic review and meta-analysisSubgroup analysis of in-hospital mortality by index time in studies defining early intubation as < 24 h (a) or < 48 h (b). a Subgroup analysis of in-hospital mortality by index time in studies defining early intubation as < 24 h. b Subgroup analysis of in-hospital mortality by index time in studies defining early intubation as < 48 hBack to article page