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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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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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
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Locations
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University of Pennsylvania
Philadelphia, Pennsylvania, 19104, United States