Mobile data collection for medical research

Executive Summary

A research team led by Stanford Medicine partnered with Onetree to address a growing challenge in medical research: the decline in survey response rates and the increasing difficulty of engaging participants over time.

To tackle this problem, our team designed and developed HIPAA-compliant mobile applications for iOS and Android, focused on simplifying data collection and improving the participant experience. In parallel, we built monitoring dashboards that enabled researchers to track response rates, subscriptions, and engagement metrics, while gaining deeper visibility into participation patterns through paradata and data visualizations.

This collaborative, cross-disciplinary initiative brought together researchers, epidemiologists, statisticians, healthcare professionals, and survey experts. By aligning diverse stakeholder needs into a cohesive product experience, the project helped increase survey participation, improve engagement through mobile-first interactions, and support researchers with actionable insights throughout the data collection process.

The Challenge: Increasing survey participation while ensuring data quality and compliance in medical research

Medical research teams were facing a persistent challenge: declining survey response rates and growing difficulty in sustaining participant engagement over time. Traditional data collection methods were becoming less effective, costly, and harder to scale, limiting the quality and continuity of research insights.

At the same time, any new digital solution needed to meet strict privacy and security requirements, including full compliance with HIPAA regulations, while remaining easy and accessible for participants with varying levels of digital literacy.

Beyond participant engagement, researchers also lacked real-time visibility into response behavior. Understanding when, how, and why participants dropped off, and how different recruitment and notification strategies performed, required better tools to monitor engagement, analyze paradata, and make informed decisions throughout the data collection process.

This combination of engagement challenges, regulatory constraints, and limited research visibility defined a complex problem space that demanded a carefully designed, user-centered solution.

A participant holding a phone showing a “Did you know?” fun fact card

The Solution: Mobile-first data collection designed for engagement, insight, and research needs

To address the challenges of participation, visibility, and compliance, our team designed and deployed two mobile applications for iOS and Android, purpose-built to support medical research data collection while prioritizing ease of use for participants and actionable insights for researchers.

From a participant perspective, the apps focused on simplifying survey completion and encouraging continued engagement over time. Features such as push notifications, clear interaction flows, and gamification elements were incorporated to motivate repeat responses and reduce drop-off throughout the research process.

In parallel, we developed two monitoring dashboards tailored to researchers’ needs. One dashboard provided visibility into response rates, subscriptions, and engagement metrics, while the second, developed in collaboration with Meta, enabled teams to evaluate recruitment performance and advertising investment, linking acquisition strategies to app downloads and participation outcomes.

All solutions were designed to meet HIPAA compliance requirements, ensuring the privacy, security, and integrity of sensitive health data. Additionally, the dashboards integrated data from multiple sources, including analytics platforms, backend systems, and external APIs, allowing researchers to analyze paradata, identify participation patterns, and make informed decisions throughout the data collection lifecycle.

Two survey screens: the completion screen with the fun facts collected, and a satisfaction question with a “Did you know?” card about carrots

Results & Impact: Improving participation efficiency and reducing research recruitment costs

The implementation of mobile-first data collection and monitoring tools delivered measurable improvements across both participation outcomes and operational efficiency.

By leveraging social media–driven recruitment and mobile survey experiences, the project significantly reduced acquisition costs compared to traditional methods. The cost of app downloads was four times lower when using social networks versus conventional ABS approaches, while participant recruitment through social media tripled relative to traditional channels.

From a research engagement perspective, the mobile applications helped address the core challenge of declining response rates. Survey participation doubled compared to previously measured methods, demonstrating the impact of simplified mobile interactions, timely notifications, and engagement-driven design.

Beyond participation metrics, the monitoring dashboards provided researchers with greater visibility into response behavior and recruitment performance, enabling informed comparisons between digital and traditional data collection strategies. This combination of improved engagement and clearer insight helped validate mobile-first approaches as a scalable and cost-effective solution for medical research data collection.

Key Considerations: Designing Research Tools for Engagement and Insight

Strategic insights drawn from designing mobile-first data collection tools for medical research.

How can mobile experiences improve participation in medical research?

Mobile-first experiences reduce friction by aligning data collection with participants’ everyday behaviors and expectations. By simplifying survey flows, optimizing interactions for smaller screens, and designing clear, intuitive interfaces, participants are more likely to complete surveys and remain engaged over time. In this project, focusing on usability and accessibility helped address declining response rates and made participation easier for a broader range of users.

What role does engagement play in sustaining survey response rates?

Sustained participation requires more than initial enrollment. Engagement mechanisms such as push notifications, clear progress feedback, and gamification elements help motivate participants to return and complete surveys consistently. Designing these interactions as part of the core product experience, rather than as add-ons, proved critical to encouraging repeat responses throughout the research lifecycle.

How can researchers gain better visibility into participation and recruitment performance?

Effective research depends on understanding how participants interact with data collection tools. Monitoring dashboards enabled researchers to track response rates, subscriptions, and engagement metrics in real time, while paradata and data visualizations provided deeper insight into participation patterns and drop-off points. This visibility allowed teams to evaluate recruitment strategies, compare digital and traditional approaches, and make informed decisions during active data collection.

How do privacy and compliance requirements shape the design of research tools?

In medical research, privacy and security are foundational to building trust and ensuring ethical data use. Designing tools that fully comply with HIPAA requirements influenced decisions across the product, from data handling and storage to user flows and access controls. Treating compliance as a design constraint, rather than a technical afterthought, helped ensure that sensitive health data remained protected without compromising usability or the participant experience.

Looking to improve participation and engagement in your research initiatives?

Designing effective research tools requires more than collecting data. It involves creating user-centered digital experiences that simplify participation, support researchers with actionable insights, and work reliably within complex, regulated environments.