People are complicated.
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Have some people set up appointments. Count how many keep them.
Are subjects using their own preferred appointment-keeping mechanism, or does the experimenter tell them how to set up the appointment?
Not all experimental subjects are created equal. In order to describe this phenomenon well, you may need to uses several axes of comparison:
- the mechanism of appointment-keeping
- whether users of different preferences perform differently
- whether using one's mechanism of preference (regardless of what that is) affects performance
Your institution probably has an "Institutional Review Board" and/or a "Human Subjects Committee". Be sure to contact them and comply with their regulations!