Abstract
Background:
Obesity is a potentially modifiable risk factor for the development and progression of kidney disease, both in adults and children. We aim to study the association of obesity and renal function in children, by comparing estimated glomerular filtration rate (eGFR) in nonoverweight and overweight/obese children. Secondarily, we aim to evaluate the accuracy of equations on eGFR estimation when compared to 24-h urinary creatinine clearance (CrCl).
Methods:
Cross-sectional study of 313 children aged 8–9 y, followed in the birth cohort Generation XXI (Portugal). Creatinine and cystatin C, GFR estimated by several formulas and CrCl were compared in 163 nonoverweight and 150 overweight/obese, according to World Health Organization growth reference.
Results:
Overweight/obese children had significantly lower eGFR, estimated by all methods, except for CrCl and revised Schwartz formula. Despite all children having renal function in the normal range, eGFR decreased significantly with BMI z-score (differences ranging from −4.3 to −1.1 ml/min/1.73 m2 per standard deviation of BMI). The Zappitelli combined formula presented the closest performance to CrCl, with higher correlation coefficients and higher accuracy values.
Conclusion:
Young prepubertal children with overweight/obesity already present significantly lower GFR estimations that likely represent some degree of renal impairment associated with the complex deleterious effects of adiposity.
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The authors gratefully acknowledge the contribution of all members of the research team and staff of Generation XXI.
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Correia-Costa, L., Afonso, A., Schaefer, F. et al. Decreased renal function in overweight and obese prepubertal children. Pediatr Res 78, 436–444 (2015). https://doi.org/10.1038/pr.2015.130
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DOI: https://doi.org/10.1038/pr.2015.130
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