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Table 3 RIFLE classification of postoperative acute renal injury

From: Acute kidney injury in septua- and octogenarians after cardiac surgery

Septuagenarians (n = 299) Octogenarians (n = 299)
Stage n; % 30-Day mortality (n; %) n; % 30-Day mortality (n; %)
No AKI 149; 49.6% 4; 2.7% 126; 42.3% 6; 4.8%
Risk 87; 29.2% 5; 5.7% 109; 36.3% 6; 5.5%
Injury 49; 16.9% 5; 10.2% 49; 16.4% 5; 10.2%
Failure 14; 4.8% 4; 28.6% 15; 5.0% 6; 40%