Table 1.

Defining parameters for identifying cohorts at high, intermediate, and low risk of advanced chronic kidney disease (CKD).

Cohort			Index eGFRa (ml·min–1·m–2)		≥90 days prior eGFR (ml·min–1·m–2)		Additional criteria
High-risk advanced CKD			<30		< 30		None
Intermediate-risk advanced CKD
	Subgroup 1	<30		≥30 and <60		Excluding AKIb using ICD-10c codes (N17)
	Subgroup 2	≥30 and <60		<30		Patients have ICD-10 codes for stage 4 and 5 CKD (N18.4 and N18.5)
Low-risk advanced CKD			≥30		≥30		Patients have ICD-10 codes for stage 4 and 5 CKD (N18.4 and N18.5)

^aeGFR: estimated glomerular filtration rate; index eGFR refers to the latest eGFR at the time of extraction of the cohort.

^bAKI: acute kidney injury.

^cICD-10: International Classification of Diseases, Tenth Revision.