Obviously the statistics for wheelchair users do not fit this question,
because people who do not use wheelchairs, and in many instances who
don't use ANY device of any type... are either
obstructed by even one step, or
can get up one or 2 steps, with some pain & difficulty, but will be
stopped by a larger flight of stairs.
And then there are people who use device X, but who can get up one or
more steps. So statistics on how many people use what device, are not
really what I'm looking for.
I'm trying to answer the question.... (Application: about an event, held
in an auditorium, that has 3 steps).... What percantage of the
population is being kept out, by this barrier?
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