Characteristic | Men (n = 238) | Women (n = 183) | P |
---|---|---|---|
Age (year) | 55 ± 17 | 55 ± 17 | 0.71 |
Ethnicity (%) | Â | Â | Â |
   European-American | 64 | 62 |  |
   African-American | 36 | 38 | 0.80 †|
Height (cm) | 177 ± 8 | 162 ± 7 | < 0.001 |
Body mass index (kg/m 2 ) a | 28 ± 8 | 29 ± 9 | 0.65 |
APACHE II score | 27 ± 8 | 29 ± 8 | 0.01 |
PaO 2 :FiO 2 b | 135 ± 63 | 126 ± 63 | 0.08 |