Dr. William McClellan of Emory University and colleagues analyzed information from 27,911 individuals -- 40.5 percent African-Americans. Among the findings:
-- After an average follow-up of 3.6 years, 133 individuals developed kidney failure.
-- There were 96 cases of kidney failure among African Americans and 37 among whites.
-- Kidney failure was most common in individuals who excreted large amounts of protein in their urine.
-- African-Americans were more likely to excrete large amounts of protein in their urine than whites.
The study, published in the Journal of the American Society Nephrology, finds African-Americans are four times more likely to develop kidney failure than whites.
The study investigators speculate several factors may explain why African-Americans tend to excrete more protein in their urine including: blood pressure and other heart-related factors, obesity, smoking, vitamin D levels, genetic differences, income and birth weight.
The findings are published in the Journal of the American Society Nephrology.