Protocol of a natural experiment to evaluate a supermarket intervention to improve food purchasing and dietary behaviours of women (WRAPPED study) in England: A prospective matched controlled cluster design
Protocol of a natural experiment to evaluate a supermarket intervention to improve food purchasing and dietary behaviours of women (WRAPPED study) in England: A prospective matched controlled cluster design
INTRODUCTION: Poor diet is a leading risk factor for non-communicable diseases and costs the National Health Service £5.8 billion annually. Product placement strategies used extensively in food outlets, like supermarkets, can influence customers' preferences. Policy-makers, including the UK Government, are considering legislation to ensure placement strategies promote healthier food purchasing and dietary habits. High-quality scientific evidence is needed to inform future policy action. This study will assess whether healthier placement strategies in supermarkets improve household purchasing patterns and the diets of more than one household member.
METHODS AND ANALYSES: This natural experiment, with a prospective matched controlled cluster design, is set in discount supermarkets across England. The primary objective is to investigate whether enhanced placement of fresh fruit and vegetables improves household-level purchasing of these products after 6 months. Secondary objectives will examine: (1) differences in intervention effects on purchasing by level of educational attainment, (2) intervention effects on the dietary quality of women and their young children, (3) intervention effects on store-level sales of fruit and vegetables and (4) cost-effectiveness of the intervention from individual, retailer and societal perspectives. Up to 810 intervention and 810 control participants will be recruited from 18 intervention and 18 matched control stores. Eligible participants will be women aged 18-45 years, who hold a loyalty card and shop in a study store. Each control store will be matched to an intervention store on: (1) sales profile, (2) neighbourhood deprivation and (3) customer profile. A detailed process evaluation will assess intervention implementation, mechanisms of impact and, social and environmental contexts.
ETHICS AND DISSEMINATION: Ethical approval was obtained from the University of Southampton, Faculty of Medicine Ethics Committee (ID 20986.A5). Primary, secondary and process evaluation results will be submitted for publication in peer-reviewed scientific journals and shared with policy-makers.
TRIAL REGISTRATION NUMBER: NCT03573973; Pre-results.
health economics, nutrition & dietetics, preventive medicine, public health
1-9
Vogel, Christina
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Crozier, Sarah
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Dhuria, Preeti
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Shand, Calum
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Lawrence, Wendy
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Cade, Janet
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Moon, Graham
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Lord, Joanne
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Ball, Kylie
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Cooper, Cyrus
e05f5612-b493-4273-9b71-9e0ce32bdad6
Baird, Janis
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10 February 2020
Vogel, Christina
768f1dcd-2697-4aae-95cc-ee2f6d63dff5
Crozier, Sarah
9c3595ce-45b0-44fa-8c4c-4c555e628a03
Dhuria, Preeti
470c09bf-2b4d-4db6-9100-a6878b4d4d32
Shand, Calum
0074f6da-d9e1-42b3-960c-11decd638884
Lawrence, Wendy
e9babc0a-02c9-41df-a289-7b18f17bf7d8
Cade, Janet
00e4216f-a895-4f13-996a-593a5c597e69
Moon, Graham
68cffc4d-72c1-41e9-b1fa-1570c5f3a0b4
Lord, Joanne
fd3b2bf0-9403-466a-8184-9303bdc80a9a
Ball, Kylie
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Cooper, Cyrus
e05f5612-b493-4273-9b71-9e0ce32bdad6
Baird, Janis
f4bf2039-6118-436f-ab69-df8b4d17f824
Vogel, Christina, Crozier, Sarah, Dhuria, Preeti, Shand, Calum, Lawrence, Wendy, Cade, Janet, Moon, Graham, Lord, Joanne, Ball, Kylie, Cooper, Cyrus and Baird, Janis
(2020)
Protocol of a natural experiment to evaluate a supermarket intervention to improve food purchasing and dietary behaviours of women (WRAPPED study) in England: A prospective matched controlled cluster design.
BMJ Open, 10 (2), , [e036758].
(doi:10.1136/bmjopen-2020-036758).
Abstract
INTRODUCTION: Poor diet is a leading risk factor for non-communicable diseases and costs the National Health Service £5.8 billion annually. Product placement strategies used extensively in food outlets, like supermarkets, can influence customers' preferences. Policy-makers, including the UK Government, are considering legislation to ensure placement strategies promote healthier food purchasing and dietary habits. High-quality scientific evidence is needed to inform future policy action. This study will assess whether healthier placement strategies in supermarkets improve household purchasing patterns and the diets of more than one household member.
METHODS AND ANALYSES: This natural experiment, with a prospective matched controlled cluster design, is set in discount supermarkets across England. The primary objective is to investigate whether enhanced placement of fresh fruit and vegetables improves household-level purchasing of these products after 6 months. Secondary objectives will examine: (1) differences in intervention effects on purchasing by level of educational attainment, (2) intervention effects on the dietary quality of women and their young children, (3) intervention effects on store-level sales of fruit and vegetables and (4) cost-effectiveness of the intervention from individual, retailer and societal perspectives. Up to 810 intervention and 810 control participants will be recruited from 18 intervention and 18 matched control stores. Eligible participants will be women aged 18-45 years, who hold a loyalty card and shop in a study store. Each control store will be matched to an intervention store on: (1) sales profile, (2) neighbourhood deprivation and (3) customer profile. A detailed process evaluation will assess intervention implementation, mechanisms of impact and, social and environmental contexts.
ETHICS AND DISSEMINATION: Ethical approval was obtained from the University of Southampton, Faculty of Medicine Ethics Committee (ID 20986.A5). Primary, secondary and process evaluation results will be submitted for publication in peer-reviewed scientific journals and shared with policy-makers.
TRIAL REGISTRATION NUMBER: NCT03573973; Pre-results.
Text
WRAPPED Protocol Paper Draft v1.4_eprints
- Accepted Manuscript
More information
Accepted/In Press date: 15 January 2020
e-pub ahead of print date: 10 February 2020
Published date: 10 February 2020
Additional Information:
Funding Information:
Funding This research and the authors of this paper are supported by the following funding sources: National Institute for Health Research (NIHR) Public Health Research Programme (17/44/46), NIHR Southampton Biomedical Research Centre, UK Medical Research Centre and University of Southampton. KB is supported by a Principal Research Fellowship from the Australian National Health and Medical Research Council (NHMRC).
Funding Information:
Competing interests This study involves a non-financial collaboration with Iceland Foods. CV, SC, PD, CS, JC, GM, JL and KB have no conflicts of interests to declare and no further financial disclosures to make. JB and WL have received grant research support from Danone Nutricia Early Life Nutrition. CC has received consultancy, lecture fees and honoraria from AMGEN, GSK, Alliance for Better Bone Health, MSD, Eli Lilly, Pfizer, Novartis, Servier, Medtronic and Roche. The study described in this manuscript is not related to these relationships.
Publisher Copyright:
© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY. Published by BMJ.
Keywords:
health economics, nutrition & dietetics, preventive medicine, public health
Identifiers
Local EPrints ID: 437234
URI: http://eprints.soton.ac.uk/id/eprint/437234
ISSN: 2044-6055
PURE UUID: 680e1d50-dcd1-4ea6-ace4-434fea3ebb9c
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Date deposited: 22 Jan 2020 17:32
Last modified: 06 Jun 2024 02:05
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Contributors
Author:
Preeti Dhuria
Author:
Calum Shand
Author:
Janet Cade
Author:
Kylie Ball
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