Intervention engagement moderates the dose-response relationships in a dietary intervention
Open accessAbstract
Behavioral interventions could lead to changes in behavior through changes in a mediator. This dose–response relationship might only hold true for those participants who are actively engaged in interventions. This Internet study investigated the role of engagement in a planning intervention to promote fruit and vegetable consumption in addition to testing the intervention effect on planning and behavior. A sample of 701 adults (mean = 38.71 years, 81% women) were randomly assigned either to a planning intervention (experimental group) or to one of 2 control conditions (untreated waiting list control group or placebo active control group). Moderated mediation analyses were carried out. Significant changes over time and time × group effects revealed the effectiveness of the intervention. The effect of the intervention (time 1) on changes in behavior (time 3; 1 month after the personal deadline study participants set for themselves to start implementing their plans) was mediated by changes in planning (time 2; 1 week the personal deadline). Effects of planning on behavior were documented only at a moderate level of intervention engagement. This indicates an inverse U-shaped dose–response effect. Thus, examining participants’ intervention engagement allows for a more careful evaluation of why some interventions work and others do not.
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DBCIs have the potential to generate datasets sufficiently large to reliably model and experimentally test mediation of outcomes by engagement with particular intervention components and to statistically control for confounding moderator effects such as baseline motivation levels.
“DBCIs have the potential to generate datasets sufficiently large to be able to reliably model and experimentally test 34 mediation of outcomes by engagement with particular intervention components and to statistically control for confounding moderator effects such as baseline motivation levels.22,26,35,36”
From Understanding and Promoting Effective Engagement With Digital Behavior Change Interventions (2016) · cites this paper as [36]
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- Authors
- Lippke, S., Corbet, J. M., Lange, D., Parschau, L., & Schwarzer, R.
- Affiliations
- Constructor University (DE)
- Freie Universität Berlin (DE)
- Uniwersytet SWPS (PL)
- Corresponding author
- Lippke, Sonia
- Venue
- Dose-Response
- Publisher
- SAGE Publications
- Published
- 2016-03-01
- Volume
- 14
- Issue
- 1
- Pages
- 1559325816637515-1559325816637515
- ISSN
- 1559-3258 (ISSN-L)
- PMC
- PMC4811006
- OpenAlex
- W2311054114
- Cited by
- 22
- References
- 44
- Citations by year
- 2026: 6 · 2025: 2 · 2024: 1 · 2023: 1 · 2021: 3 · 2020: 2 · 2019: 4 · 2018: 1 · 2017: 1 · 2016: 1
- FWCI
- 3.60
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Dose-Response (publishedVersion, cc-by-nc)
- Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Research Bank (Australian Catholic University) (submittedVersion, cc-by-nc)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Refubium (Universitätsbibliothek der Freien Universität Berlin) (submittedVersion, cc-by-nc)
- Universitätsbibliothek der FU Berlin Hochschulschriftenstelle u. Dokumentenserver
- Funders
- Bundesministerium für Bildung und Forschung
- Topics
- Social Sciences › Psychology › Applied Psychology › Behavioral Health and Interventions
- Health Sciences › Nursing › Nutrition and Dietetics › Nutrition, Health and Food Behavior
- Social Sciences › Arts and Humanities › Literature and Literary Theory › Media Influence and Health
- Keywords
- intervention engagement, dose-response relationship, intervention planning, fruit and vegetable intake, dietary behavior change, behavioral interventions, moderated mediation
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