Table 1.

Patient characteristics (n   = 553)

	Value
Age (year), mean, SD, range	62.5 ± 15.8 (16 to 96)
Gender (male), mean, range	343 (62%) (16 to 96)
APACHE II score, mean, SD, range	24.2 ± 7.9 (0 to 49), 46 missing
ICU length of stay (days), mean, SD, range	11.7 ± 11.6 (2 to 56)
ICU mortality, n (%)	127 (23%)
Pneumonia on admission, n (%)	131 (25%)

Mean (SD), or number (percentage), when appropriate.