Above Average

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The studies in question make perfect sense when you look at the logistical realities of daily living in the modern world, vis-a-vis the location and abilities of a sub-set of "people" as compared to the larger control group of "all people." You see.  Its a very sensible conclusion to draw, from an individual perspective when you look at the one physical clue that eludes so many of us and is not present in the stated assumptions of this challenge nor, indeed, of the studies that have inspired this seemingly unbalanced conclusion.

Or, to state the obvious:
94% of people in the studies live on the second floor or higher.