5.a: Outcomes of prolonged mechanically ventilated patients. 5.b: Prevalence of delirium in mechanically ventilated patients. 5.c: Performance of tracheostomy and outcomes of tracheostomized patients. 5.d: Outcomes of mechanically ventilated patients due to neurologic diseases. 5.f: Outcomes of mechanically ventilated patients due to chronic obstructive pulmonary disease.