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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

Vogel, C, Crozier, S, Dhuria, P, Shand, C, Lawrence, W, Cade, J, Moon, G, Lord, J, Ball, K, Cooper, C and Baird, J 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, vol. 10, no. 2, pp. 1-9, doi: 10.1136/bmjopen-2020-036758.

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Title 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
Author(s) Vogel, C
Crozier, S
Dhuria, P
Shand, C
Lawrence, W
Cade, J
Moon, G
Lord, J
Ball, KORCID iD for Ball, K orcid.org/0000-0003-2893-8415
Cooper, C
Baird, J
Journal name BMJ Open
Volume number 10
Issue number 2
Article ID e036758
Start page 1
End page 9
Total pages 9
Publisher BMJ
Place of publication London, Eng.
Publication date 2020-02-10
ISSN 2044-6055
2044-6055
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Medicine, General & Internal
General & Internal Medicine
VEGETABLE CONSUMPTION
PRICE DISCOUNTS
HEALTH
FRUIT
STRATEGIES
OBESITY
QUESTIONNAIRE
INEQUALITIES
METAANALYSIS
EDUCATION
health economics
nutrition & dietetics
preventive medicine
public health
Summary 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.
Language eng
DOI 10.1136/bmjopen-2020-036758
Indigenous content off
Field of Research 1103 Clinical Sciences
1117 Public Health and Health Services
1199 Other Medical and Health Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2020, Author(s) (or their employer(s))
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30135246

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.