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Assessing the progression of renal disease in clinical studies: effects of duration of follow-up and regression to the mean. Modification of Diet in Renal Disease (MDRD) Study Group.

A S Levey, J J Gassman, P M Hall and W G Walker
JASN March 1991, 1 (9) 1087-1094; DOI: https://doi.org/10.1681/ASN.V191087
A S Levey
National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD.
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J J Gassman
National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD.
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P M Hall
National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD.
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W G Walker
National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD.
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Abstract

Many clinical studies of the effects of low-protein and low-phosphorus diets on the course of chronic renal disease have used the rate of decline in renal function to assess the rate of progression. In this report, data from the feasibility phase of the Modification of Diet in Renal Disease Study were used to analyze methods used in other studies. The focus is particularly on the effects of duration of follow-up and of regression to the mean. The findings are summarized as follows. (1) During the mean follow-up period of 14.1 months, rates of decline in glomerular filtration rate, creatinine clearance, and the reciprocal of the serum creatinine concentration were highly variable among individuals, and mean rates of decline were slow. (2) Precision of estimates of individual rates of decline in renal function were relatively low and improved with increasing duration of follow-up. (3) Correlations between rates of decline in creatinine clearance and the reciprocal of the serum creatinine concentration with glomerular filtration rate in individuals were significant but weak and became stronger with increasing duration of follow-up. (4) After entry into the study, mean rate of decline in the reciprocal of the serum creatinine concentration became less negative. The change predicted simply from regression to the mean was 68.4% of the observed change.(ABSTRACT TRUNCATED AT 250 WORDS)

  • Copyright © 1991 by American Society of Nephrology
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Journal of the American Society of Nephrology
Vol. 1, Issue 9
1 Mar 1991
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Assessing the progression of renal disease in clinical studies: effects of duration of follow-up and regression to the mean. Modification of Diet in Renal Disease (MDRD) Study Group.
A S Levey, J J Gassman, P M Hall, W G Walker
JASN Mar 1991, 1 (9) 1087-1094; DOI: 10.1681/ASN.V191087

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Assessing the progression of renal disease in clinical studies: effects of duration of follow-up and regression to the mean. Modification of Diet in Renal Disease (MDRD) Study Group.
A S Levey, J J Gassman, P M Hall, W G Walker
JASN Mar 1991, 1 (9) 1087-1094; DOI: 10.1681/ASN.V191087
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