Table 1.

Baseline characteristics for the overall study population and the original CKiD study participants^*

Characteristics	Overall Study Population (n=484)	Participants with Plasma Samples (n=673)	Original CkiD Study (n=960)
Age, years	12 ± 4	12 ± 4	11 ± 5
Female, n (%)	192 (40)	263 (39)	359 (37)
Black, n (%)	60 (12)	102 (15)	153 (17)
Glomerular diagnosis, n (%)	149 (31)	206 (31)	254 (26)
Anemia, n (%)	155 (32)	224 (35)	283 (31)
Hypertension, n (%)	242 (50)	342 (54)	465 (52)
Body mass index Z-score	0.39 ± 1.14	0.39 ± 1.17	0.39 ± 1.19
eGFR, mL/min per 1.73 m2†	54 ± 21	52 ± 21	52 ± 22
Serum albumin, g/dL	4.35 ± 0.43	4.33 ± 0.43	4.35 ± 0.42
Urine protein-to-creatinine ratio	0.89 ± 1.88	0.93 ± 1.87	0.90 ± 1.74

^*Values for continuous variables are presented as mean ± standard deviation. Values for categorical variables are presented as n (%).

^†eGFR was measured using CKiD under 25 equation (Pierce et al., 2021). Abbreviations: CKiD, Chronic Kidney Disease in Children study; eGFR, estimated glomerular filtration rate.