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Six-year incidence of proteinuria in type 1 diabetic African-Americans

From the ¹University of Medicine and Dentistry, New Jersey Medical School, Institute of Ophthalmology and Visual Science, Newark, NJ
² Kean University, Department of Mathematics, Union, NJ
³ East Orange Veterans Affairs Medical Center, East Orange, NJ

Roymo{at}umdnj.edu

ABSTRACT

Objective:To report the 6-year incidence of proteinuria and associated risk factors in African-Americans with type 1 diabetes mellitus.

Research Design and Methods:African-Americans (n=483) with type 1 diabetes were re-examined in a 6-year follow-up study. Proteinuria and creatinuria were measured in 4-hour timed urine specimens obtained at initial and follow-up visits. Other evaluations included a structured clinical interview, ocular examination, masked grading of seven stereoscopic fundus photographs, blood pressure measurements, blood assays, and administration of the Beck Depression Inventory (BDI).

Results:Over the 6-year period, 117(42.9%) of the 473 patients at risk developed any defined as either microalbuminuria (26.0%) or overt (16.9%) proteinuria, 87(23.5%) progressed from micro or no albuminuria to overt proteinuria, 39(8.7%) end-stage renal disease (ESRD), and 40(20.6%) regressed. Peak incidence of any proteinuria occurred for patients who were 10-14 years of age or had 5-10 years of diabetes at baseline. Multiple regression analysis showed that baseline albumin excretion rate (AER), systemic hypertension, blood cholesterol, and high BDI depression scores were significant and independent risk factors for incidence of any proteinuria.

Conclusions:In African-Americans with type 1 diabetes the 6-year incidence of proteinuria is high, particularly among young patients and those with a relatively short duration of diabetes at baseline. Baseline AER is the strongest predictor for incidence of any proteinuria.

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