Variable | All (n = 5242) | AKI stage 1 (n = 2458) | AKI stage 2 (n = 1181) | AKI stage 3 (n = 1603) | P value* |
---|---|---|---|---|---|
Patients characteristics | Â | Â | Â | Â | Â |
 Sex (male) | 3176 (60.59) | 1591 (64.73) | 663 (56.14) | 922 (57.52) | < .01 |
 Age (years) | 70.2 [58.0–78.9] | 70.5 [58.4–78.9] | 72.5 [60.9–80.1] | 68.0 [56.2–77.4] | < .01 |
 SAPS II | 50 [37–67] | 46 [35–61] | 52 [39–69] | 54 [41–72] | < .01 |
 SOFAa | 5 [3, 10] | 5 [3–8] | 6 [3–8] | 5 [3–9] | < .01 |
 Pulmonary insufficiency  immuno | 651 (12.42) | 373 (15.17) | 147 (12.45) | 131 (8.17) | < .01 |
 Suppression | 946 (18.05) | 389 (15.83) | 223 (18.88) | 334 (20.84) | < .01 |
AKI risk factors | Â | Â | Â | Â | Â |
 Cardiac insufficiency | 961 (18.33) | 434 (17.66) | 247 (20.91) | 280 (17.47) | 0.03 |
 Cirrhosis | 344 (6.56) | 147 (5.98) | 79 (6.69) | 118 (7.36) | 0.22 |
 Diabetes | 1098 (20.95) | 506 (20.59) | 252 (21.34) | 340 (21.21) | 0.83 |
 Nephrotoxicb | 1355 (25.85) | 611 (24.86) | 322 (27.27) | 422 (26.33) | 0.26 |
 Contrast agent | 330 (6.30) | 167 (6.79) | 67 (5.67) | 96 (5.99) | 0.36 |
 Aminoside | 954 (18.20) | 421 (17.13) | 235 (19.90) | 298 (18.59) | 0.11 |
 Glycopeptide | 404 (7.71) | 170 (6.92) | 94 (7.96) | 140 (8.73) | 0.10 |
Reason for ICU admission | Â | Â | Â | Â | Â |
 Admission |  |  |  |  | < .01 |
 Medical | 4031 (77.15) | 1870 (76.23) | 919 (78.21) | 1242 (77.77) |  |
 Emergency surgery | 827 (15.83) | 356 (14.51) | 197 (16.77) | 274 (17.16) |  |
 Scheduled surgery | 367 (7.02) | 227 (9.25) | 59 (5.02) | 81 (5.07) |  |
 Shock | 2148 (40.98) | 862 (35.07) | 554 (46.91) | 732 (45.66) | < .01 |
 ARF | 1183 (22.57) | 706 (28.72) | 272 (23.03) | 205 (12.79) | < .01 |
 Hospital stay before ICU admission (days) | 0 [0;3] | 0 [0;2] | 0 [0;3] | 0 [0;3] | 0.81 |
Outcome | Â | Â | Â | Â | Â |
 AKI duration | 2 [1–5] | 2 [1–4] | 2 [1–4] | 3 [2–6] | < .01 |
 Day-28 renal recovery | 3085 (58.85) | 1613 (65.62) | 741 (62.74) | 731 (45.60) | < .01 |
 Day-28 mortality | 1307 (24.93) | 559 (22.74) | 327 (27.69) | 421 (26.26) | < .01 |
 Discharge alive at Day 28 | 3537 (67.47) | 1704 (69.32) | 769 (65.11) | 1064 (66.38) | 0.03 |
 RRT requirement during ICU stay | 1336 (25.49) | 275 (11.19) | 179 (15.16) | 882 (55.02) | < .01 |