Figure 2
From: Tracheostomy timing and the duration of weaning in patients with acute respiratory failure
Curves showing the proportion of patients liberated from mechanical ventilation (MV) according to the time that readiness-to-wean criteria were met, based upon the Cox proportional hazards regression model (see 'Patients and methods' for details). The 21 early tracheostomy (ET) patients were liberated more rapidly (median duration of weaning, 3 days) than the selective tracheostomy (ST) group (median duration of weaning, 7 days).