Just-in-the-Moment Adaptive Interventions (JITAI): A Meta-Analytical Review

Area of Science:

• Behavioral Science
• Health Technology
• Digital Health

Background:

• Just-in-time, adaptive interventions (JITAIs) are emerging, utilizing technology to deliver personalized support precisely when needed.
• These interventions leverage mobile phones and sensors to monitor individual states and adapt accordingly.

Purpose of the Study:

• To systematically evaluate the efficacy of JITAIs by analyzing effect sizes from empirical studies.
• To identify factors contributing to JITAI effectiveness, specifically aspects of tailoring.

Main Methods:

• A meta-analysis of 33 empirical studies was conducted to extract effect sizes of primary outcomes from JITAI treatments.
• Sensitivity analyses were performed to confirm the robustness of the findings across different conditions and populations.

Main Results:

• JITAIs showed moderate to large effect sizes compared to waitlist-control (g = 1.65) and non-JITAI treatments (g = 0.89).
• Participants in JITAI interventions exhibited significant positive changes (g = 0.79).
• Tailoring interventions to both past behavior patterns and current needs, and using both human agents and algorithms for feedback, were associated with greater efficacy.

Conclusions:

• JITAIs are effective in producing positive outcomes across various health behaviors and populations.
• The efficacy of JITAIs is significantly enhanced by specific tailoring strategies, including personalization based on individual history and real-time needs, and a hybrid approach to feedback delivery.