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A Cross-Disciplinary and Multi-Modal Experimental Design for Studying Near-Real-Time Authentic Examination Experiences

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Cross-Platform Ecological Momentary Assessment App (JTrack-EMA+): Development and Usability Study.

Mehran Sahandi Far^1,2, Jona M Fischer¹, Svea Senge³

¹Research Centre Jülich, Institute of Neuroscience and Medicine, Brain and Behaviour (INM-7), Jülich, Germany.

Journal of Medical Internet Research

|January 28, 2025

Summary

This study developed JTrack-EMA+, a cross-platform app for ecological momentary assessments (EMAs). While promising for real-time data collection, compliance decreased over time in a pilot study.

Keywords:

application biomarker costly data management digital biomarkers ecological momentary assessment mobile health mobile phone mobility monitoring remote monitoring smartphone user experience

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Area of Science:

Digital Health
Clinical Research Technology
Mobile Health Interventions

Background:

Traditional data collection methods are costly and limited.
Smartphone-based ecological momentary assessments (EMAs) offer real-time, longitudinal data.
Technical obstacles hinder EMA adaptability, availability, and interoperability.

Purpose of the Study:

Develop a cross-platform EMA app (JTrack-EMA+) for consistent user experience across operating systems.
Ensure adaptability for diverse study designs while maintaining security and privacy.
Implement the app following FAIR principles to reduce integration burdens for researchers.

Main Methods:

Utilized the Flutter framework for cross-platform compatibility.
Developed a complementary online dashboard (JDash) using Python and Django for study management.
Incorporated flexible assessment design, configurable logic, supplementary materials, and GDPR compliance.

Main Results:

A pilot study with 480 days of follow-up assessed participant compliance.
Average 6-month compliance was 49.3%.
Compliance significantly declined from 66.7% in month 1 to 42% in month 6 (P=.004).

Conclusions:

JTrack-EMA+ offers a platform-independent solution for deploying EMAs in clinical studies.
Facilitates remote and home-based assessments, providing insights into daily patient life.
Valuable for populations with limited mobility or healthcare access.