Table 2.
Acute Kidney Injury Risk Quartiles by Preoperative Characteristics: Multivariable Models
| AKI Stage | Cohort Patients with Complete Data, n (%) | Quartile 1 Low Preoperative Risk, n (%) | Quartile 2 Medium Preoperative Risk, n (%) | Quartile 3 High Preoperative Risk, n (%) | Quartile 4 Highest Preoperative Risk, n (%) |
|---|---|---|---|---|---|
| Derivation | |||||
| N | 70,929 | 17,733 | 17,732 | 17,732 | 17,732 |
| Any stage | 6,077 (8.6) | 363 (2.0) | 755 (4.3) | 1,453 (8.2) | 3,506 (20) |
| ≥ Stage II | 1,207 (1.7) | 56 (0.3) | 150 (0.8) | 290 (1.6) | 711 (4.0) |
| Stage III | 327 (0.5) | 16 (0.1) | 39 (0.2) | 84 (0.5) | 188 (1.1) |
| Validation | |||||
| N | 36,497 | 8,829 | 9,580 | 9,225 | 8,863 |
| Any stage | 3,117 (8.5) | 185 (2.1) | 415 (4.3) | 757 (8.2) | 1,760 (20) |
| ≥ Stage II | 647 (1.8) | 43 (0.5) | 76 (0.8) | 171 (1.9) | 357 (4.0) |
| Stage III | 174 (0.5) | 10 (0.1) | 18 (0.2) | 48 (0.5) | 98 (1.1) |
AKI, acute kidney injury.