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Table 1 CKD staging according to age (eGFR, mL/min/1.73 m2)

From: KNOW-Ped CKD (KoreaN cohort study for outcomes in patients with pediatric CKD): Design and methods

Stage/Age <2 weeks 2–7 weeks (<2 months) 2–23 months (<2 years) ≥2 years
1 ≥30 ≥49 ≥72 ≥90
2 20–29 33–48 48–71 60–89
3 10–19 16–32 24–47 30–59
4 5–9 8–15 12–23 15–29
5 <5 <8 <12 <15