Table 1. Hospital Characteristics Overall and in Annual Hospital Volume–Based Tertiles for Surgical Aortic Valve Replacement (SAVR) and Mitral Valve (MV) Replacement or Repair.
| Variable | Overall | SAVR | MV Replacement or Repair | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Tertile 1 | Tertile 2 | Tertile 3 | P Valuea | Tertile 1 | Tertile 2 | Tertile 3 | P Valuea | ||
| No. of hospitals | 682 | 228 | 229 | 225 | NA | 232 | 222 | 228 | NA |
| Annual Volume, Median (IQR) | |||||||||
| All SAVR | 43 (23-76) | 17 (11-23) | 43 (36-52) | 97 (76-153) | <.001 | 19 (11-26) | 42 (31-57) | 94 (69-151) | <.001 |
| SAVR + CABG | 15 (8-27) | 6 (4-9) | 16 (12-20) | 34 (26-50) | <.001 | 7 (4-11) | 15 (11-22) | 32 (23-49) | <.001 |
| Isolated SAVR | 20 (10-35) | 8 (5-10) | 20 (16-24) | 44 (35-70) | <.001 | 8 (5-13) | 19 (14-25) | 41 (30-69) | <.001 |
| All MV replacement and repair | 21 (11-40) | 8 (5-12) | 22 (15-28) | 51 (36-81) | <.001 | 7 (5-11) | 21 (18-25) | 52 (40-82) | <.001 |
| MV replacement and repair + CABG | 5 (3-10) | 2 (1-4) | 6 (4-9) | 12 (8-18) | <.001 | 2 (1-4) | 5 (4-8) | 13 (9-19) | <.001 |
| Isolated MV replacement and repair | 10 (4-19) | 4 (2-6) | 10 (7-14) | 25 (16-42) | <.001 | 4 (2-5) | 10 (8-13) | 25 (19-42) | <.001 |
| Bed Size, %b | |||||||||
| Small | 8.7 | 12.6 | 6.7 | 6.7 | <.001 | 12.4 | 6.4 | 7.1 | <.001 |
| Medium | 21.8 | 29.7 | 21.0 | 14.8 | 29.3 | 23.9 | 12.4 | ||
| Large | 69.5 | 57.7 | 72.3 | 78.5 | 58.2 | 69.7 | 80.5 | ||
| Hospital Characteristics, % | |||||||||
| Teaching hospital | 50.2 | 35.6 | 46.0 | 69.1 | <.001 | 33.8 | 47.2 | 69.5 | <.001 |
| Urban location | 94.3 | 90.1 | 96.0 | 96.9 | .002 | 88.9 | 95.9 | 98.2 | <.001 |
| Regionc | |||||||||
| Northeast | 13.0 | 5.7 | 10.9 | 22.7 | <.001 | 6.0 | 14.4 | 18.9 | <.001 |
| Midwest | 27.4 | 35.1 | 26.2 | 20.9 | 33.6 | 25.7 | 22.8 | ||
| South | 37.7 | 41.2 | 38.0 | 33.8 | 41.4 | 35.1 | 36.4 | ||
| West | 21.9 | 18.0 | 24.9 | 22.7 | 19.0 | 24.8 | 21.9 | ||
Abbreviations: CABG, coronary artery bypass grafting; IQR, interquartile range; NA, not applicable.
a
P value for negative trend.
b
Bed size categorization using Agency for Healthcare Research and Quality methods (large bed size vs others).
c
Northeast vs other regions.