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Planning a digital detox

Findings from a randomized controlled trial to reduce smartphone usage time

Journal Article (2025)
Author(s)

Lina Christin Brockmeier (Freie Universität Berlin, University of Melbourne)

Jan Keller-Findeisen (Freie Universität Berlin)

Tilman Dingler (TU Delft - Human-Centred Artificial Intelligence)

Natalia Paduszynska (SWPS University of Social Sciences and Humanities)

Aleksandra Luszczynska (SWPS University of Social Sciences and Humanities, University of Melbourne)

Theda Radtke (Bergische Universität Wuppertal )

Research Group
Human-Centred Artificial Intelligence
DOI related publication
https://doi.org/10.1016/j.chb.2025.108624
More Info
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Publication Year
2025
Language
English
Research Group
Human-Centred Artificial Intelligence
Volume number
168
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Abstract

In the recent years, studies on health consequences of smartphone usage time have increased, yet findings on the effectiveness of usage interventions remain unclear. This preregistered study investigates the effectiveness of a planning intervention to reduce total smartphone usage time. Additionally, it examines the interventions’ underlying mechanisms of self-efficacy, intention, action, and coping planning. A primary analysis of a randomized controlled trial, with data collected at three measurement points was conducted. Three cohorts of university students were recruited during the period prior to the end-of-term exams. A total of N = 787 participants were allocated to either an intervention condition (n = 389) or a control condition (n = 398). At baseline measurement (T1) the intervention condition formed up to three actions and three coping plans. Self-reported self-efficacy, intention, action, and coping planning as well as objectively measured smartphone usage were assessed up to a three-weeks follow-up. The effectiveness of the intervention and the mediating mechanisms were evaluated using linear mixed models. The analysis revealed no significant effect on total smartphone usage time. With respect to the interventions underlying mechanisms, results show a significant indirect effect of self-efficacy at T2, on a reduction in total smartphone usage time at T3 but no evidence for intention, action, or coping planning.