Table 4.

Risk Discrimination and Continuous Net Reclassification Index for stage I and II AKI by UACR and Urine dipstick measurements

	Stage I AKI	Stage II AKI
Area Under the ROC Curve (SE)
Albuminuria	0.604 (0.017)	0.591 (0.036)
Clinical Model	0.669 (0.017)	0.723 (0.036)
Clinical Model + Albuminuria	0.695 (0.016)	0.731 (0.037)
p-value*	0.0055	0.50
Dipstick	0.573 (0.016)	0.573 (0.036)
Clinical Model	0.673 (0.017)	0.728 (0.036)
Clinical Model + Dipstick	0.688 (0.017)	0.732 (0.037)
p-value*	0.0272	0.70
Continuous Net Reclassification Index (SE)
Albuminuria	0.289 (0.062)	0.290 (0.135)
p-value	<.0001	0.0312
Dipstick	0.248 (0.063)	0.285 (0.135)
p-value	<.0001	0.0347

Clinical model includes age (per year), sex, white, pre-op eGFR (per mL/min per 1.73 m²), diabetes, elective surgery, hypertension, chronic heart failure, cardiac catheterization in past 48 hours, myocardial infarction, and type of surgery.

^*p-value comparing the addition of albuminuria to the clinical model

^†p-value comparing the addition of dipstick to the clinical model

Abbreviations: ROC- receiver operating curve, AKI- acute kidney injury, UACR- urine albumin to creatinine ratio, SE- standard error