The study was large, including information on more than 31,000 men and women aged 65 and older, all of whom had received a possible or probable Alzheimer's diagnosis.
Patient ethnicity, race, age, gender, educational background, marital status, living situation, and cognitive function scores were recorded at initial diagnosis, as was the first subsequent evidence of dementia onset.
The authors reported that 81 percent of the patients were white, 12 percent were black, 4 percent were Hispanic, and 1.5 percent were Asian.
The average patient age was about 78, and 65 percent were women.
During the observation period, patients lived an average of 4.8 years following diagnosis, and almost 39 percent of the patients died. Autopsies were conducted on 3,000 of the deceased.
Overall, deaths were more common among patients who were older, male, and had poorer initial cognitive skills scores.
With respect to race and ethnicity, the research team found that white patients were more likely to die than patients of other backgrounds. The death rate was 41 percent among whites compared to 30 percent among blacks and 21 percent for Hispanics.
After accounting for all the demographic factors that might influence outcome, the researchers concluded that black and Hispanic Alzheimer's patients had a lower risk for mortality than their white counterparts.
Mehta and her colleagues stressed, however, that the pool of ADC patients examined was not necessarily representative of U.S. Alzheimer's patients as a whole. Most patients received care outside the confines of a government-funded medical center, she said, and as such they would presumably have received a much more varied, non-standard
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