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Important Considerations

Upon project creation, all REDCap projects only have a single arm by default. Typically, only a single arm is needed for most project workflows. Arms can be used in the event that a study has groups of different participants, which follow unique workflows, however we discourage using Arms for this use-case and instead suggest the use of (FORM DISPLAY LOGIC).

  • Exporting & Reporting metrics function differently when working with multiple Arms:

    • x, y, z

  • When adding new records to the project, it’s critical the participant be added to the correct arm. Often users forget they have multiple arms causing error.

    • Once a participant is added under a specific arm, there is no built-in REDCap functionality to move the participant to different arm

So when should you use Arms?

The Process

  1. To use ‘Arms’ your project must first be enabled as a longitudinal project

    1. If you project isn’t already longitudinal, this typically indicates you do not/should not utilize the arms functionality! More info: https://utahctsi.atlassian.net/servicedesk/customer/portal/3/article/2341765121?src=1897803665

  2. Navigate to your ‘Project Setup’ page and click ‘Define My Events’

  3. Here you will see the option to add an addition arm

    1. Title Arm & Save

  4. Designate instrument to Arm events (just like you would in a single armed, longitudinal project)

    1. Designate & Save

Additional Considerations

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