N-of-1 methods: A practical guide to exploring trajectories of behaviour change and designing precision behaviour change interventions

Dominika Kwaśnicka , Felix Naughton


Objectives (1) To introduce N-of-1 methods and how they can help the researchers identify predictors of behavioural outcomes, (2) to provide examples of studies that test individual theory-based predictions of physical activity and/or exercise; (3) to provide a practical example dataset to illustrate how to design and undertake a basic analysis for an N-of-1 study; and (4) to suggest a future agenda for N-of-1 physical activity and exercise research. Design Factors for consideration when designing an N-of-1 study include variability of predictors and outcomes, assessment frequency and appropriate analysis methods. Existing literature and piloting can help inform these aspects. Methods We use a dataset of 24 individuals who collected data over 28 days to illustrate example analysis procedures. Data, guidance and associated SPSS and R syntax are made available to provide researchers with tools to learn about and practice N-of-1 analysis. Results Guidance on dealing with missing data, looking at graphical representations of N-of-1 data, managing autocorrelation using the prewhitening method and analysing N-of-1 datasets is provided. Using the example dataset, we demonstrate how to identify antecedents of physical activity (steps) to assess directionality of associations. We also include an overview of aggregating N-of-1 datasets using multilevel modelling. Conclusions N-of-1 methodology provides a means of tracking individual patterns of behaviour and identifying potential antecedents of physical activity and exercise to help determine causality. Assisted by mobile technologies, there is great potential to enrich our understanding of movement behaviour using this approach to inform interventions.
Author Dominika Kwaśnicka (Filia we Wrocławiu / II Wydział Psychologii we Wrocławiu)
Dominika Kwaśnicka,,
- II Wydział Psychologii we Wrocławiu
, Felix Naughton
Felix Naughton,,
Journal seriesPsychology of Sport and Exercise, ISSN 1469-0292, (N/A 100 pkt)
Issue year2020
Publication size in sheets0.3
Article number101570
Keywords in EnglishN-of-1; Idiographic methods; Within person design; N-of-1 analysis; R; SPSS; Statistics
ASJC Classification3202 Applied Psychology
URL https://www.sciencedirect.com/science/article/pii/S1469029218307970?via%3Dihub
Languageen angielski
N-of-_1_oswiadczenie.pdf 356.33 KB
N-of-1_tekst.pdf 823.16 KB
Score (nominal)100
Score sourcejournalList
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.75; WoS Impact Factor: 2018 = 2.71 (2) - 2018=3.662 (5)
Citation count*23 (2021-04-11)
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