Table 1.
Baseline characteristics of study participants at enrollment
| Variable | No. (%) |
|---|---|
| N | 260 |
| Female | 137 (53) |
| Race/ethnicity | |
| Non-Hispanic white | 200 (77) |
| Black/African American/Hispanic/Latino | 60 (23) |
| Home oxygen | 55 (21) |
| Prehospital dialysis | 20 (8) |
| Mean (SD) | |
| Age, yr | 56.4 (15.3) |
| APACHE III score | 72.8 (25.5) |
| Mean arterial blood pressure, mm Hg | 76.8 (22.9) |
| PaCO2, mm Hg | 44.6 (16.9) |
| PaO2:FiO2 | 182.8 (84.2) |
Definition of abbreviations: APACHE = Acute Physiology and Chronic Health Evaluation; FiO2 = fraction of inspired oxygen; PaCO2 = arterial carbon dioxide pressure; PaO2 = arterial oxygen tension pressure; SD = standard deviation.