The distance from or distance traveled may impact outcomes, either positively or negatively.

In some situations, better outcomes are seen when a person travels a greater distance or lives farther away.


In other situations, being near-by has better outcome. Preference may be given to someone immediately available rather than to someone who may take time to arrive.


Failing to measure or compensate for distance bias can impact the significance of research findings.


Differential diagnosis:

(1) reporting bias (for example, a person living further away may report fewer complications)

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