A study of 31,000 people with Alzheimer's disease in the U.S. found that people diagnosed with the condition lived, on average, 4.8 years after their diagnosis. However, there were considerable differences in the length of time people from different ethnic backgrounds survived. People from a Latin American background lived 40% longer than White people while African-Americans lived 15% longer. Asian, American Indian and White people all lived with the disease for about the same length of time.
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