Clinical trial NCT03518151: Women's Responses to Adjusted Product Placement and Its Effects on Diet - 1 (WRAPPED1)
Official title: Women's Responses to Adjusted Product Placement and Its Effects on Diet - 1 (WRAPPED1)
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Diet Modification
Keywords: public health
dietary inequalities
environment design
Lead sponsor: University Hospital Southampton NHS Foundation Trust
Sponsor class: OTHER
Collaborators: name: University of Southampton
name: Medical Research Council
First posted: 2018-05-08
Enrollment: 150
Sex: FEMALE
Minimum age (years): 18
Maximum age (years): 45
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: NON_RANDOMIZED
Intervention model: PARALLEL
Intervention model description: WRAPPED1 is a natural experiment with a prospective matched controlled cluster design
Primary purpose: PREVENTION

Brief summary: This research project aims to help address a gap in understanding about the micro-environmental determinants of diet by exploring whether improving the placement of fresh and frozen fruit and vegetables and removing temptations of confectionary at checkouts in discount supermarkets influences the dietary behaviours of women aged 18-45 years and whether it is cost effective.

Detailed description: This study is a natural experiment with a prospective cluster controlled design. The intervention includes creating a new fresh fruit and vegetable section at the store entrance, placing frozen fruit and vegetable in the first aisle and removing confectionery from checkouts; it will be implemented continuously for 6 months in discount supermarkets.

The control condition is provision of a limited range of fresh fruit and vegetables, all placed at the back of the store, frozen vegetables in a middle aisle and confectionery sold at checkouts. Control and intervention stores will be located across England to improve generalizability of the sample. Each control store will be matched to an intervention store on i) sales profile, ii) customer profile and iii) neighbourhood deprivation (IMD deciles). Control stores will be located at least 50 miles from an intervention store to avoid contamination.

Women customers aged 18-45 years with a store loyalty card, who regularly shop at one of 3 intervention or 3 matched-control stores in England will be invited to participate. Women will be recruited via email, letter, SMS, shopping receipt note, Facebook advertisement, and in-store approach. Participants will contact the research team via text, email or Freephone and will be consented by phone after eligibility is assessed. Participants will be asked to complete four telephone surveys (baseline and 1, 3 and 6 months post intervention commencement) and will be offered 3x £10 Love2Shop vouchers that will be sent after completion of the baseline, 3 and 6 month surveys. A secure system to transfer store and participant loyalty card sales data has been established and confidentiality upheld through the use of study identification numbers.

Economic evaluation will be conducted from individual and retailer perspectives. Participant surveys will collect data about food expenditure, and travel costs to and from supermarkets that will be supplemented by loyalty card data. Refurbishment and ongoing costs, plus impact on sales will be estimated.

A process evaluation will be conducted to monitor intervention implementation (in-store surveys), mechanisms of impact (interviews with a sub-sample of supermarket staff and participants) and context (analysis of grocery shopping habits - location and frequency of different stores).

Eligibility criteria: Inclusion Criteria:

* Women aged 18-45 years
* Hold an store loyalty card
* Shop regularly in the 12-weeks before recruitment according to loyalty card data
* Shoppers who choose items in-store but opt for home delivery will be eligible

Exclusion Criteria:

* Women under the age of 18 or over 45 years
* Shopped less than once in 12-weeks prior to recruitment
* Online-only shopper
* No store loyalty card

Primary outcomes:
measure: Dietary quality score
timeFrame: 3 month follow-up post intervention commencement
Secondary outcomes:
measure: Child's dietary quality score
timeFrame: 3 month follow-up post intervention commencement
measure: Women's daily fruit and vegetable portions
timeFrame: 3 month follow-up post intervention commencement
measure: Women's weekly confectionery intake
timeFrame: 3 month follow-up post intervention commencement
measure: Weekly sales of fresh fruit and vegetables
timeFrame: 12 week period following intervention commencement
measure: Weekly sales of confectionery
timeFrame: 12 week period following intervention commencement
Other outcomes:
Locations:
Study officials:
References:
citation: Vogel C, Crozier S, Penn-Newman D, Ball K, Moon G, Lord J, Cooper C, Baird J. Altering product placement to create a healthier layout in supermarkets: Outcomes on store sales, customer purchasing, and diet in a prospective matched controlled cluster study. PLoS Med. 2021 Sep 7;18(9):e1003729. doi: 10.1371/journal.pmed.1003729. eCollection 2021 Sep.