Accurate eGFR assessment is crucial for early CKD detection, management and optimal medication dosing, but its validation, especially for Cystatin C-based equations, are limited in African children and adolescents with CKD. This study evaluates eGFR equations utilising Cystatin C and creatinine in this population.
Methods:This prospective community-based cohort study assessed CKD in children aged 1 to 18 using Cystatin C and serum creatinine. We evaluated eGFR performance with the Bland-Altman plot and ROC curve. Lin's concordance assessed agreement between various equations and the reference standard (Schwartz CKiD equations). Pairwise ROC curve comparisons determined statistical differences in estimation equation performance.
Results:The mean age of 688 children and adolescents evaluated for CKD was 7.8 (± 3.9) years, with 341 (49.6%) being male. The Pottel equation had the lowest mean bias (-3.41, 95% CI: -2.57 to -4.25), highest discriminatory power (0.989), highest accuracy across all age groups, and highest CKD detection.Bouvet's formula had the highest mean bias ] across all age groups, but an average ROC discriminatory power of 0.889. Zappitelli had a lower ROC discriminatory value (0.547) but a modest bias ). Lin's concordance with Schwartz CKiD was highest with Pottel (0.99) and lowest with Bouvet (0.08). Zappetti and Chehade disagreed most, but Pottel and Chehade agreed closely on equation pairwise comparisons.
Conclusion:In African children with CKD, Pottel's height-independent equation outperformed Chehade, Zappitelli, and Bouvet in terms of ROC discriminatory value, accuracy, and Schwartz CKiD concordance.Glomerular ltration rate (GFR) serves as a crucial indicator of renal function, and its estimation through the use of equations, such as the estimated GFR (eGFR), has become an essential tool in clinical practice.However, the applicability and accuracy of eGFR determination methods can vary signi cantly across diverse populations due to differences in age, ethnicity, and environmental factors. 4,5, 6,7 Sub-Saharan Africa, a region marked by its unique demographic and health landscape, presents distinct challenges and opportunities in pediatric nephrology. The pediatric population in this region faces a disproportionately higher burden of renal diseases, often in the context of prevalent infectious diseases, malnutrition, limited access to healthcare, inadequate renal supportive care resources, socioeconomic challenges, genetic predispositions and the scarcity of renal transplantation services. 8,9,10,11 . Delays in making diagnoses and a lack of awareness make it even more di cult to effectively manage CKD often at advance stages at presentation in this populatuon. 3 Yet, there is a paucity of data regarding the performance of cystatin C-based eGFR determination methods or in combination with creatinine, speci cally in sub-Saharan African children.The old Schwartz equation is widely used for estimating eGFR in older African children with normal kidney function, showing good agreement with measured...