Table 2.
Hospital categories and defining variables
| Variables | Hospital Categories |
|||
|---|---|---|---|---|
| Large | Medium-sized For-Profit | Medium-sized Nonprofit | Small | |
| Number of hospitals in each category | 42 | 67 | 25 | 19 |
| Bed number category | >300 | 100–300 | 100–300 | <100 |
| Annual VDRF case volume, mean (SD) | 683 (415) | 337 (172) | 200 (82) | 95 (48) |
| Annual ED case volume, mean (SD) | 16,173 (6,754) | 10,562 (4,593) | 6,608 (2,526) | 3,138 (1,292) |
| Annual ICU case volume, mean (SD) | 8,646 (7,250) | 4,444 (2,683) | 3,310 (2,395) | 1,132 (704) |
| Noncardiac ECMO* | Yes | No | No | No |
| Solid organ transplant* | Yes | No | No | No |
| Number (%) of all VDRF admissions† | 45,528 (50.9%) | 32,511 (36.3%) | 9,341 (10.4%) | 2,073 (2.3%) |
| Number (%) of patients with VDRF undergoing interhospital transfer‡ | 768 (1.68%) | 639 (1.97%) | 476 (5.10%) | 208 (10.03%) |
Definition of abbreviations: ECMO = extracorporeal membrane oxygenation; ED = emergency department; ICU = intensive care unit; VDRF = ventilator-dependent respiratory failure.
*
One or more cases of ECMO or any solid organ transplant in the dataset between 2012 and 2013.
†
VDRF admissions (n [%]) numerator/denominator = VDRF admissions in each hospital category/total number of VDRF admissions (89,943) × 100.
‡
Patients with VDRF undergoing interhospital transfer (n [%]) numerator/denominator = patients with VDRF receiving transfer in each hospital category/total number of patients with VDRF in each hospital category × 100.