From: Normality data of eGFR and validity of commonly used screening tests for CKD in an area with endemic CKD of unknown etiology; need for age and sex based precise cutoff values
eGFR level (mL/min/1.73m2)
n
%
95% confidence limits for proportion
G1 ≥ 90
4314
55.5
54.6- 56.8
G2 60–89
2633
33.9
32.7- 34.8
G3a 45–59
468
6.0
5.5- 6.6
G3b 30–44
188
2.4
2.1- 2.8
G4 15–29
113
1.5
1.2- 1.7
G5 ≤ 15
52
0.7
0.5- 0.9