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JAMA. 2009;301(3):276.

Incorrect Data: In the Original Contribution entitled "Effect of Physical Activity on Cognitive Function in Older Adults at Risk for Alzheimer Disease: A Randomized Trial" published in the September 3, 2008, issue of JAMA (2008;300[9]:1027-1037), incorrect data were reported in Table 7, which appears on page 1036. In the row "Total ADAS-Cog [Alzheimer Diseas Assessment Scale–Cognitive Subscale]" and in the "Control Group" columns, the geometric mean (SD) for the completers should have been "6.4 (1.8)" and "10.6 (1.4)" for the dropouts.

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