User Data Access
Participants collect a lot of data over the course of a study. This data forms a valuable record of their health, which should not disappear when the study ends. Give participants access to their data when the study is over. If participants leave the study early, they still deserve access to the data they collected.
Participants grow frustrated if they cannot access their own data.
-> Participants need access to their data after they leave the study. If they cannot access their data after they finish, and lose the valuable health record they created during the study, they will become frustrated. Participants can feel that joining the study was not useful for them. As a result, they might refuse to participate in future studies.
Worst Case Scenario: Participants Get Frustrated with Research In General
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Giving participants access to their own data makes participating worthwhile.
Explain to participants what types of data were collected from them. Then let them choose which data types they want to download. Give them options for viewing their data in different formats. For example, give participants both easy-to-read reports and spreadsheets of raw data.

Remember: if your research app ever stops working, participants still need to be able to use their data. Offer formats (e.g., .csv or even plain text) that do not rely on short-lived technologies. Make sure that participants have a way to keep a copy of the health record they created, no matter what happens to your research app in the future.

Tell participants they should not use the data they download to draw conclusions about their health. Clearly state that the data should not be used for medical purposes like medical advice, diagnosis, or treatment.

After the study ends, you will likely write papers about the data. Tell participants when your paper comes out, so that they can read about what you learned.
Best Practice: Data Download Options
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What to prepare?
Step 1
Determine what data participants will be able to download.
Create a list, with short descriptions, of the data types you will collect from participants during the study. Think about what formats you can provide the data in, and what formats would be useful for participants. Not every format is useful. For example, raw accelerometer data may be less useful than stepcount data.
Step 2
Figure out what participants need to know about the limits of the data.
Make sure you know if the data your participants collect is valid for medical use. If it is not, make sure to state that clearly to participants.
Step 3
Have a way to inform participants about publications.
In the consent process, ask participants if they want to be informed about papers that result from the study. Have a way to notify them of publications as they are released. If you can, set aside funds for open-access publication.
Resources
Case Studies
Should Research Subjects Have Access to Their Raw Data?
Carolyn Y. Johnson
Information Access. Raw Personal Data: Providing Access.
Jeantine E. Lunshof, George M. Church and Barbara Prainsack
Here's How to Download All Your Data From Facebook.
Abby Ohlheiser
UK vs. US: How Much of Your Personal Data Can You Get?
Natasha Singer and Prashant S. Rao
Google Takeout
Google
Resources
Inactivity Notifications Patterns