Table 1 Baseline characteristics of the study population
|  | Overall (n = 89) | Anesthesia Machine (n = 17) | ICU ventilator (n = 72) | P value |
|---|---|---|---|---|
Age, yr | 59 [51–67] | 62 [53–70] | 59 [51–66] | 0.333 |
Male sex, no. (%) | 70 (78.7) | 12 (70.6) | 58 (80.6) | 0.510 |
BMI, kg/m2 | 28 [26–31] | 27 [25–30] | 28 [26–32] | 0.262 |
Race, no. (%) | Â | Â | Â | 0.657 |
 White | 73 (82.0) | 13 (76.4) | 60 (83.3) |  |
 Black | 2 (2.2) | 1 (5.8) | 1 (1.3) |  |
 Asian | 2 (2.2) | 0 (0) | 2 (2.7) |  |
 Other | 12 (13.4) | 3 (17.6) | 9 (12.5) |  |
Severity at admission | ||||
 APACHE II score | 11 [8–14] | 14 [8–16] | 11 [8–14] | 0.133 |
 SOFA score | 5 [3–7] | 6 [4–8] | 4 [3–7] | 0.188 |
Comorbidities, no. (%) | ||||
 Hypertension | 46 (51.7) | 7 (41.2) | 39 (54.2) | 0.422 |
 Diabetes mellitus | 16 (18.2) | 3 (17.7) | 13 (18.3) | 1.000 |
 Obesity | 25 (28.4) | 3 (17.7) | 22 (31.0) | 0.375 |
 COPD | 5 (5.6) | 1 (5.9) | 4 (5.6) | 1.000 |
 Hypercholesterolemia | 15 (16.9) | 3 (17.7) | 12 (16.7) | 1.000 |