Table 2 Potentially eligible patients in participating units recruited and not recruited (data from Case Mix Programme (CMP))
Recruited (n = 648)Not recruited (n = 996)
Mean (SD) age (years)66.2 (9.9)66.8 (10.2)
Mean (SD) CAPS33.9 (12.2)33.9 (12.1)
Men (%)48.849.2
Admission out of hours (18.00–08.00 h) (%)49.752.8
Admission at weekend (%)26.726.7
ICU survival (%)80.678.2
  • CAPS, COPD acute physiology score; ICU, intensive care unit.