Table 2.
Patient characteristics stratified by hospital volume tertile
| Characteristics |
Low Volume (1–74) |
Intermediate Volume (75–299) |
High Volume (300 + ) |
P Value |
|---|---|---|---|---|
| (n = 497) | (n = 3,326) | (n = 5,992) | ||
| Mean age (SD) | 71.6 (15.1) | 68.7 (14.6) | 65.7 (17.0) | P < 0.0001 |
| Female, % | 54 | 54 | 31 | P = 0.0053 |
| Race, % | P < 0.0001 | |||
| White | 58 | 64 | 64 | |
| Black | 36 | 35 | 34 | |
| Other | 6 | 1 | 2 | |
| Insurance, % | P < 0.0001 | |||
| Medicare | 70 | 71 | 65 | |
| Medicaid | 11 | 8 | 12 | |
| Commercial | 14 | 15 | 16 | |
| Other | 5 | 6 | 7 | |
| Mean Charlson score (SD) | 1.5 (1.8) | 1.8 (2.0) | 1.6 (1.8) | P = 0.2976 |
| Mechanical ventilation, % | 27 | 36 | 38 | P < 0.0001 |
| Mean mortality probability (SD) | 26.7 (12.6) | 28.8 (13.4) | 28.9 (13.6) | P = 0.0153 |
| In-hospital mortality, % | 32 | 29 | 29 | P = 0.1838 |
| Mean length of stay (SD) | 8.0 (7.3) | 12.7 (14.1) | 14.9 (17.9) | P = 0.0001 |