Trial reportJournal of medical Internet research2026
Effects of a Short Mobile Intervention on Digital Health Literacy in Adolescents and Teachers: Randomized Controlled Trial.
Trial report in Journal of medical Internet research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundDigital health literacy is an essential skill for processing health-related information in today's technology-driven society. Recent literature highlights deficits in digital health literacy among adolescents and legislative initiatives to secure its promotion have been introduced (eg, in the German Social Code Book V). However, few interventions target adolescents; existing programs often overlook critical aspects like graph literacy or lack applicability in schools and rigorous scientific evaluation. To overcome these limitations, short mobile interventions-optimized for mobile devices and flexible deployment in schools-were developed to promote digital health literacy.
objectiveThis study aimed to evaluate the effectiveness of one of these interventions (focusing on graph-based health information) and to assess its quality and applicability within educational settings as a proof-of-concept for the further development of similar interventions for adolescents.
methodsA randomized-controlled pre-post trial with an active control group was conducted across two independent samples in a web-based survey: adolescents in secondary schools (14-17 years) and teachers. Participants in each sample were randomly assigned (1:1 allocation) to the experimental or control group. Following baseline data collection (T1), participants completed their assigned interventions, immediately followed by postassessments (T2). The experimental intervention is a mobile-friendly e-learning module (approximately 10 minutes) featuring interactive tasks focused on interpreting graph-based health information. The control intervention followed the same design and logic but covered a different topic. The primary outcome was subjective knowledge regarding the intervention's topics. Secondary outcomes included objective knowledge (quiz scores) and 2 adapted subscales of the Digital Health Literacy Instrument (DHLI: "evaluating reliability" and "determining relevance"). Educational quality, visual aesthetics, and practical applicability were also assessed at T2.
resultsAmong adolescents (experimental group: n=251; control group: n=249), a significant interaction effect was observed only for objective knowledge (F
conclusionsThis study demonstrates that short mobile interventions hold significant promise for the promotion of digital health literacy (eg, graph literacy) within school environments. These interventions can effectively teach objective knowledge to adolescents and teachers, but improving their digital health literacy may require more comprehensive or multimodule approaches.
trial registrationGerman Clinical Trials Register DRKS00037830; https://drks.de/search/de/trial/DRKS00037830/details.
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