Asking differently may change who signs up for PAD exercise study
NCT ID NCT04536038
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looked at whether asking people to "opt in" or "opt out" of a clinical trial changes how many people with peripheral artery disease (PAD) actually join. Over 5,000 adults with PAD were contacted by email. The goal was to see which approach leads to more enrollment and whether it changes the types of people who sign up. No treatment was tested—only the way the invitation was worded.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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University of Pennsylvania
Philadelphia, Pennsylvania, 19104, United States
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