The 2011 annual report of the U.S. Alzheimer's Association has revealed the huge burden of the condition. It is estimated that 5.4 million people in the U.S. suffer from Alzheimer's - about one in eight senior citizens. Nearly 15 million people in the U.S. look after someone with Alzheimer's disease amounting to 17 billion hours of unpaid care worth more than $202bn. More than 60% of caregivers said they were stressed and more than a third said they were depressed. The $202bn in unpaid care comes on top of around $183bn of formal care from healthcare workers, hospitals and nursing homes, up $11bn on a year ago.
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