Table 1 Demographic and clinical characteristics

Age (years)^a

71.0 (63 to 71)

Sex (male/female; %)

61.2/38.8

APACHE II score^a

19.0 (15 to 23)

ICU length of stay (days)^a

8.0 (5 to 16)

Hospital length of stay (days)^a

23.0 (14 to 40)

Ventilation days+

6.0 (3 to 13)

Type of admission (%)

   Nonsurgical^b

53.2

   Elective surgery^c

8.7

   Acute surgery^d

38.1