Figure 3.

Survival curves of independent predictors of weaning failure. (a) Difference in rates of successful weaning between patients who underwent tracheostomy within 21 days (dotted line) and those who underwent tracheostomy later than 21 days (solid line; P < 0.001). (b) Difference in rates of successful weaning between patients with an arterial oxygen tension (PaO₂)/fractional inspired oxygen (FiO₂) ratio > 250 (dotted line) and those with a PaO₂/FiO₂ ratio < 250 (solid line; P < 0.001) before tracheostomy. (c) Difference in rates of successful weaning between the patients with post-tracheostomy pneumonia (solid line) and those without post-tracheostomy pneumonia (dotted line; P < 0.001)