Clinical Nephrology – Epidemiology – Clinical Trial
Kidney International (2005) 67, 685–690; doi:10.1111/j.1523-1755.2005.67128.x
Decreased renal function among adults with a history of nephrolithiasis: A study of NHANES III
DANIEL L GILLEN, ELAINE M WORCESTER and FREDRIC L COE
Department of Health Studies and Department of Medicine, University of Chicago, Chicago, Illinois
Correspondence: Daniel Gillen Ph.D., 5841 South Maryland Ave., MC 2007, Department of Health Studies, The University of Chicago, Chicago, IL 60637. E-mail:dgillen@health.bsd.uchicago.edu
Received 16 April 2004; Revised 2 July 2004; Re-revised 23 August 2004; Accepted 1 September 2003.
Abstract
Decreased renal function among adults with a history of nephrolithiasis: A study of NHANES III.
Background
Although intuitively appealing, the hypothesis that nephrolithiasis is associated with decreased renal function has not thoroughly been investigated. Because the prevalence of nephrolithiasis and chronic renal disease in westernized societies has risen over the past three decades, we sought to determine if persons with a history of kidney stones have lower renal function relative to nonstone formers.
Methods
We used data from the Third National Health and Nutrition Examination Survey (NHANES III) to compare estimated glomerular filtration rate (GFR) between persons over age 30 with and without a history of kidney stones. In total, 876 persons with a history of stones, and 14,129 persons without stones were available for analysis.
Results
We observed that the association between history of stones and estimated GFR depends on body mass index (BMI) (P = 0.004). After adjustment for potential confounding factors, mean estimated GFR in stone formers with a BMI 
27 kg/m2 was 3.4 mL/min/1.73 m2 lower than that of similar nonstone formers (95% CI -5.8, -1.1) (P = 0.005). No difference was found among persons with a BMI <27 kg/m2. The probability of an overweight stone former having an estimated GFR between 30 and 59 mL/min/1.73 m2 relative to a GFR above 90 mL/min/1.73 m2 was nearly twice that of a similar nonstone former [relative risk ratio (RRR) = 1.87, 95% CI 1.06, 3.30].
Conclusion
Among overweight persons, nephrolithiasis may not merely be a disease of stones, but may also reduce kidney function. Further work in alternate study samples is needed to validate this finding and determine the mechanisms responsible.
Keywords:
nephrolithiasis, kidney stones, glomerular filtration rate
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