An N-of-1 study of daily alcohol consumption following minimum unit pricing implementation in Scotland

Kwasnicka, D., Boroujerdi, M., O’Gorman, A., Anderson, M. , Craig, P. , Bowman, L. and McCann, M. (2021) An N-of-1 study of daily alcohol consumption following minimum unit pricing implementation in Scotland. Addiction, 116(7), pp. 1725-1733. (doi: 10.1111/add.15382) (PMID:33372333)

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Background and aims: Within the context of Scotland's policy change to implement a minimum unit price (MUP) per unit of alcohol sold in licensed premises, this study used an N‐of‐1 design to assess between‐person differences in the psychological and social factors associated with daily alcohol consumption. Design and setting: A mixed‐methods approach combined N‐of‐1 observational studies, comprising daily surveys followed by qualitative social network interviews (not reported here). Peer researchers with lived experience of substance use were involved in the study design and fieldwork was conducted in towns and rural areas in the East of Scotland. Participants/cases: Twenty‐five adults with current or recent history of alcohol dependence recruited for three 12‐week waves: 11 in wave 1 (pre‐MUP), 11 in wave 2 (pre‐ and post‐MUP) and three in wave 3 (post MUP). Measurements: Gender, age, alcohol and other drug use history. Daily surveys for 12 weeks captured information about factors in the last 24 hours, e.g. amount and type of alcohol consumed, stress, social contact. Findings: Each participant was in the daily survey for a mean of 64 days [standard deviation (SD) = 42; median = 59], with a response rate of 48%; 15 participants provided sufficient data for analysis. Factors related to daily alcohol consumption differed between individuals. Models suggested that some individuals with high initial consumption reduced drinking after MUP, but explanatory factors differed, e.g. changing motivation was important for some, while alcohol availability was important for others. Conclusions: Adapting N‐of‐1 methods for an observational study uncovered differences in alcohol consumption change before and after minimum unit pricing implementation in Scotland, evidence of individual differences in the factors relating to alcohol consumption patterns and some evidence that post‐MUP consumption changes may be related to changing psychosocial factors.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Anderson, Martin and Craig, Professor Peter and McCann, Dr Mark and Boroujerdi, Dr Massoud
Creator Roles:
Boroujerdi, M.Data curation, Formal analysis, Methodology, Validation
Anderson, M.Data curation, Formal analysis, Methodology
Craig, P.Data curation, Funding acquisition, Methodology
McCann, M.Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Validation, Visualization
Authors: Kwasnicka, D., Boroujerdi, M., O’Gorman, A., Anderson, M., Craig, P., Bowman, L., and McCann, M.
College/School:College of Medical Veterinary and Life Sciences > Institute of Health and Wellbeing > MRC/CSO SPHSU
Journal Name:Addiction
ISSN (Online):1360-0443
Published Online:28 December 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Addiction 116(7): 1725-1733
Publisher Policy:Reproduced under a Creative Commons License
Related URLs:
Data DOI:10.17605/OSF.IO/ESW4D

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
168560MRC SPHSU/GU Transfer FellowshipsLaurence MooreMedical Research Council (MRC)MC_PC_13027HW - MRC/CSO Social and Public Health Sciences Unit
727661SPHSU Core Renewal: Complexity in Health Improvement Research ProgrammeLaurene MooreMedical Research Council (MRC)MC_UU_12017/14IHW - MRC/CSO SPHU
Chief Scientist Office (CSO)SPHSU14
727631SPHSU Core Renewal: Relationships & Health Improvement Research ProgrammeLisa McDaidMedical Research Council (MRC)MC_UU_12017/11IHW - MRC/CSO SPHU
Chief Scientist Office (CSO)SPHSU11
727671SPHSU Core Renewal: Informing Healthy Public Policy Research ProgrammePeter CraigMedical Research Council (MRC)MC_UU_12017/15IHW - MRC/CSO SPHU
Chief Scientist Office (CSO)SPHSU15
727651SPHSU Core Renewal: Measuring and Analysing Socioeconomic Inequalities in Health Research ProgrammeAlastair LeylandMedical Research Council (MRC)MC_UU_12017/13IHW - MRC/CSO SPHU
Chief Scientist Office (CSO)SPHSU13