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Participants were recruited between August 2020 through July 2021, and all individuals participated for a maximum of 6 months of follow-up.
Enrollment and group assignment. A total of 116 participants left this study before completing a single survey. Further, 284 participants were included in the analysis dataset. DCH: Datacubed Health.
Descriptive statistics for demographic variables across each study arm are reported in Table 4.
Participant demographics by study arm.
J Particip Med 2025;17:e50225
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Specifically, this secondary analysis included individuals who enrolled after Sync4 Science launch (August, 2018) and after the BYOD Fitbit protocol being launched (November, 2020). For all cohorts, activities where participants completed the surveys were considered as “active/engaged” events. All survey questions included a “prefer not to answer” option. Survey completeness was analyzed across participants by counting the number of questions answered as “prefer not to answer”.
Interact J Med Res 2025;14:e56803
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Recruitment was conducted between July 6, 2022, and August 29, 2022, and the trial was completed on November 16, 2022. During data collection, each participant was given a participant ID number when they registered with the app. The data were stored using these ID numbers. The key to the code that matched participants’ full name to their ID number was saved in an electronic password-protected file, which was stored on an encrypted drive.
JMIR Mhealth Uhealth 2024;12:e49443
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