Table 1.
Results of univariate analysis between high-volume and low-volume centers
| High-volume center (n = 7787) | Low-volume center (n = 3820) | P value | |
|---|---|---|---|
| Age in years, mean (SD) | 54.4 (13.7) | 54.5 (13.6) | .76 |
| Length of stay in days, median (IQR) | 14.9 (10.3–21.7) | 13.9 (8.9–20.1) | <.01 |
| Total hospital mortality, n (%) | 864 (11.0) | 542 (14.2) | <.01 |
| Female sex, n (%) | 5339 (68.6) | 2612 (68.5) | .94 |
| Endovascular control of aneurysm, n (%) | 4543 (58.5) | 1952 (51.2) | .04 |
| Patient transferred into hospital, n (%) | 2738 (35.4) | 751 (19.7) | <.01 |
| Insurance coverage, n (%) | 6489 (87.5) | 3124 (81.3) | .24 |
| NIS-SSS, median (IQR) | 2.3 (1–14.9) | 1.8 (1–12.5) | .41 |
| Teaching hospital, n (%) | 7548 (97.3) | 2653 (72.9) | <.01 |
| Urban hospital, n (%) | 7689 (99.1) | 3598 (98.5) | .76 |
| Hospital size, n (%) | |||
| Small | 372 (4.4) | 120 (2.9) | |
| Medium | 764 (10.0) | 623 (17.0) | |
| Large | 6627 (85.5) | 2917 (80.1) | .16 |
| Hospital region, n (%) | |||
| Northeast | 1381 (18.4) | 460 (12.7) | |
| Midwest | 1607 (20.8) | 1010 (26.7) | |
| South | 2577 (32.7) | 1458 (37.6) | |
| West | 2222 (28.1) | 892 (23.0) | .47 |