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Women who develop slight but detectable deficits in memory and mental acuity late in life tend to decline faster than men with mild impairment, researchers reported on Tuesday.

Some two-thirds of the five million Americans with Alzheimer’s disease are women, in part because women live longer. Researchers have searched in vain for decades to determine other reasons for the disparity.

The authors of the new study, who presented their work at the Alzheimer’s Association International Conference in Washington, said their findings indicated nothing about possible causes of gender differences and had no immediate implications for treatment.

To read this rest of this study, as reported by Benedict Carey for the New York Times on July 21, 2015, click here.