Understanding Between-Person Interventions with Time-Intensive Longitudinal Outcome Data: Longitudinal Mediation Analyses

Corina Berli, Jennifer Inauen, Gertraud Stadler, Urte Scholz, Patrick E. Shrout

Research output: Contribution to journalArticlepeer-review


Background: Mediation analysis is an important tool for understanding the processes through which interventions affect health outcomes over time. Typically the temporal intervals between X, M, and Y are fixed by design, and little focus is given to the temporal dynamics of the processes. Purpose: In this article, we aim to highlight the importance of considering the timing of the causal effects of a between-person intervention X, on M and Y, resulting in a deeper understanding of mediation. Methods: We provide a framework for examining the impact of a between-person intervention X on M and Y over time when M and Y are measured repeatedly. Five conceptual and analytic steps involve visualizing the effects of the intervention on Y, M, the relationship of M and Y, and the mediating process over time and selecting an appropriate analytic model. Results: We demonstrate how these steps can be applied to two empirical examples of health behavior change interventions. We show that the patterns of longitudinal mediation can be fit with versions of longitudinal multilevel structural equation models that represent how the magnitude of direct and indirect effects vary over time. Conclusions: We urge researchers and methodologists to pay more attention to temporal dynamics in the causal analysis of interventions.

Original languageEnglish (US)
Pages (from-to)476-488
Number of pages13
JournalAnnals of Behavioral Medicine
Issue number5
StatePublished - May 1 2021


  • Between-person intervention
  • Health behavior change interventions
  • Intensive longitudinal data
  • Longitudinal mediation
  • Multilevel mediation
  • Temporal dynamics

ASJC Scopus subject areas

  • General Psychology
  • Psychiatry and Mental health


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