Table 2.
Patient Outcomes and Center Characteristics
| Overall N = 10 378 | <175 N = 3657 | 175–275 N = 3176 | ≥275 N = 3545 | P Value | |
|---|---|---|---|---|---|
| Outcomes | |||||
| Mortality | 301 (3) | 127 (3) | 102 (3) | 72 (2) | <0.001 |
| ICU length of stay, d | 3.7 (1.9, 8.8) | 3.7 (1.9, 8.8) | 3.1 (1.8, 8.4) | 3.9 (2.1, 9.0) | <0.001 |
| CMV after cardiac surgery | 7648 (74) | 2675 (73) | 2576 (81) | 2397 (68) | <0.001 |
| NIV after cardiac surgery | 1008 (10) | 326 (9) | 431 (14) | 251 (7) | <0.001 |
| Duration of CMV, h | 28.7 (11.4, 104.9) | 24.4 (8.2, 95.7) | 26.9 (7.7, 99.5) | 44.9 (19.0, 118.9) | <0.001 |
| Reintubation within 96 h | 353 (3) | 112 (3) | 76 (2) | 165 (5) | <0.001 |
| Center data | |||||
| Dedicated cardiac ICU | 6255 (60) | 1130 (31) | 1580 (50) | 3545 (100) | <0.001 |
| Annual discharges per center | 812 (568, 1064) | 808 (568, 812) | 882 (631, 1077) | 1787 (411, 1787) | <0.001 |
| Annual cardiac surgery per center | 229 (96, 297) | 78 (42, 123) | 238 (229, 240) | 310 (297, 436) | <0.001 |
Abbreviations: CMV, conventional mechanical ventilation; ICU, intensive care unit; NIV, noninvasive ventilation.
Continuous variables are summarized by the triplet of quartiles 50th (25th and 75th). Categorical variables are summarized as n (%).