Table 3. Patients having dialysis or death as an outcome, n (% of patients with each diagnosis), and relative risk, RR (95% Confidence interval), in each AKI category in the Development versus Validation cohorts.

	Development cohort		Validation cohort
Patients with outcome n(%)	No Structural-AKI	Structural-AKI	No Structural-AKI	Structural-AKI
No Functional-AKI	9 (8.5)	8 (21.1)	10 (9.7)	6 (14.6)
Functional-AKI	8 (17.8)	20 (30.7)	6 (13.0)	19 (30.2)
Relative Risk of outcome (95% Confidence interval)
No Functional-AKI	1 (referent)	2.48 (1.94 to 2.81)	1 (referent)	1.51 (1.26 to 1.62)
Functional-AKI	2.09 (1.70 to 2.31)	3.62 (2.95 to 4.16)	1.34 (1.16 to 1.42)	3.11 (2.53 to 3.55)

Functional-AKI: Plasma creatinine >26.4 µmol/L (0.3 mg/dl) in 48 hours or 50% in 7 days.

Structural-AKI: Urinary NGAL >140 ng/ml.

Outcome: Need for dialysis or death within 30 days.