A new study indicates that far more Americans than previously estimated–5.6 million people, or about 1 in 50–have some level of paralysis in their arms and/or legs. The reason for the increase has to do with a shift in definition rather than demographics; people or their family members were simply asked about functional capabilities rather than their conformance to a specific medical model. The study didn’t even count non-nervous system causes for limited limb movement, such as arthritis. Moral for product developers: scratch a functional definition and find a more significant market for universal design features than you may have thought.
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