What trend was observed regarding the proportion of U.S. elderly with activity limitations between 1997 and 2009?

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The observed trend regarding the proportion of U.S. elderly with activity limitations between 1997 and 2009 shows a decrease. This decline suggests improvements in various factors such as healthcare access, advancements in medical treatments, and better living conditions, which may have contributed to the elderly population maintaining their mobility and independence for a longer period.

Additionally, this decrease could reflect more effective public health initiatives aimed at promoting healthy aging. For instance, there has been increased awareness and attention to physical activity, preventive care, and rehabilitation services that support the elderly in maintaining their overall health, enabling them to perform daily activities without limitations.

The other options do not align with the data trends observed during this time period. For example, a significant increase or drastic variation would imply a less stable improvement, while remaining the same would contradict the documented trends showing better health outcomes for the elderly population.