Ecological momentary assessment of self-rated health, daily strategies and self-management app use among trauma-exposed adults.

Background: The process whereby trauma-exposed people benefit from self-management apps to increase health is poorly understood. Objective: We investigated whether access to a self-management smartphone app for posttraumatic stress (PTSD Coach) improved momentary self-rated health (SRH) and if use of a self-management app or specific strategies related to SRH. Method: Participants were 179 adults in Sweden with trauma exposure in the past 2 years who were enrolled in a randomized trial of PTSD Coach versus waitlist. Ecological momentary assessments (EMA) were collected twice daily during 21 consecutive days from participants in both groups, with questions about momentary SRH as well as self-management app use and use of strategies (social support, distress management, monitoring of discomfort and seeking information) in the preceding 12 hours. Results: Overall, neither access to PTSD Coach nor reported use of an app in the preceding hours was related to SRH. Even so, people with access to PTSD Coach reported using more social support over time. Socializing and use of social support predicted greater SRH. Use of other strategies was associated with worse short-term SRH. Conclusions: Momentarily improved health relates to utilization of social support. However, the directionality of the day-to-day associations is unclear; uncertainty remains around the timing for assessing these relationships.