Table 1.
Baseline Characteristics of Study Population
| Characteristic | High-volume (n = 3,223) |
Low volume (n = 5,147) |
p Value |
|---|---|---|---|
| Mean age, y (SD) | 61.9 (13.3) | 63.2 (13.3) | <0.001 |
| Gender, n (%) | 0.349 | ||
| Male | 1,648 (51.2) | 2,686 (52.2) | |
| Female | 1,573 (48.8) | 2,458 (47.8) | |
| Race, n (%) | <0.001 | ||
| Caucasian | 1,952 (81.7) | 2,833 (73.6) | |
| African-American | 172 (7.2) | 418 (10.9) | |
| Hispanic | 138 (5.8) | 350 (9.1) | |
| Asian or Pacific Islander | 59 (2.5) | 133 (3.5) | |
| Native-American | 11 (0.5) | 13 (0.3) | |
| Other | 58 (2.4) | 104 (2.7) | |
| Mean Charlson Index (SD) | 6.1 (3.7) | 6.1 (3.7) | 0.273 |
| Mortality, % | 3.1 | 9.0 | <0.001 |