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Protocol of a natural experiment to evaluate a supermarket intervention to improve food purchasing and dietary behaviours of (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 (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 (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 NHS £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 six months. Secondary objectives will examine: i) differences in intervention effects on purchasing by level of educational attainment, ii) intervention effects on the dietary quality of women and their young children, iii) intervention effects on store-level sales of fruit and vegetables, and iv) 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: i) sales profile, ii) neighbourhood deprivation and iii) 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.

Registration: ClinicalTrials.gov registration: NCT03573973
health economics, nutrition & dietetics, preventive medicine, public health
2044-6055
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
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Baird, Janis
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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
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Baird, Janis
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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 (WRAPPED study) in England: a prospective matched-controlled cluster design. BMJ Open, 10 (2), 1-9, [e036758]. (doi:10.1136/bmjopen-2020-036758).

Record type: Article

Abstract

Introduction: poor diet is a leading risk factor for non-communicable diseases and costs the NHS £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 six months. Secondary objectives will examine: i) differences in intervention effects on purchasing by level of educational attainment, ii) intervention effects on the dietary quality of women and their young children, iii) intervention effects on store-level sales of fruit and vegetables, and iv) 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: i) sales profile, ii) neighbourhood deprivation and iii) 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.

Registration: ClinicalTrials.gov registration: NCT03573973

Text
WRAPPED Protocol Paper Draft v1.4_eprints - Accepted Manuscript
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More information

Accepted/In Press date: 15 January 2020
e-pub ahead of print date: 10 February 2020
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
ORCID for Christina Vogel: ORCID iD orcid.org/0000-0002-3897-3786
ORCID for Sarah Crozier: ORCID iD orcid.org/0000-0002-9524-1127
ORCID for Wendy Lawrence: ORCID iD orcid.org/0000-0003-1264-0438
ORCID for Graham Moon: ORCID iD orcid.org/0000-0002-7256-8397
ORCID for Joanne Lord: ORCID iD orcid.org/0000-0003-1086-1624
ORCID for Cyrus Cooper: ORCID iD orcid.org/0000-0003-3510-0709
ORCID for Janis Baird: ORCID iD orcid.org/0000-0002-4039-4361

Catalogue record

Date deposited: 22 Jan 2020 17:32
Last modified: 26 Nov 2021 03:04

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Contributors

Author: Christina Vogel ORCID iD
Author: Sarah Crozier ORCID iD
Author: Preeti Dhuria
Author: Calum Shand
Author: Wendy Lawrence ORCID iD
Author: Janet Cade
Author: Graham Moon ORCID iD
Author: Joanne Lord ORCID iD
Author: Kylie Ball
Author: Cyrus Cooper ORCID iD
Author: Janis Baird ORCID iD

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