Condition category
Nutritional, Metabolic, Endocrine
Date applied
29/03/2018
Date assigned
17/04/2018
Last edited
12/04/2018
Prospective/Retrospective
Retrospectively registered
Overall trial status
Ongoing
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims:
Previous research has suggested that wine glass size might affect purchasing of wine in bars and restaurants, with larger glasses leading to more wine being purchased. The aim of the current study is to try to directly replicate an effect of glass size on purchasing, testing this effect in the same restaurant as in a previous study.

Who can participate?
This study takes place in one independent restaurant that has previously taken part in a similar study.

What does the study involve?
Depending on the study period, the size of the wine glass provided differs (being either 290ml, 350ml or 450ml). Portion sizes of wine are not altered. The study consists of thirteen periods, each lasting two weeks, starting in April 2018. In sequential order, the
restaurant offers: 290ml glasses; 350ml glasses; 290ml glasses; 450ml glasses; 290ml glasses; 350ml glasses; 290ml glasses; 450ml glasses; 290ml glasses; 350ml glasses; 290ml glasses; 450ml glasses; 290ml glasses. We examine the effect of glass size on the wine volume (in ml) sold per day in the restaurant.

What are the possible benefits and risks of participating?
The results from this study will help to establish the reproducibility and size of any effect of wine glass size on purchasing. Sales of wine may increase or decrease as a result of participating in the study.

Where is the study run from?
Behaviour and Health Research Unit at the University of Cambridge (UK)

When is the study starting and how long is it expected to run for?
February 2018 to December 2018

Who is funding the study?
Department for Health (UK)

Who is the main contact?
Dr Rachel Pechey (scientific)

Trial website

Contact information

Type

Scientific

Primary contact

Dr Rachel Pechey

ORCID ID

Contact details

Behaviour and Health Research Unit
Institute of Public Health
Forvie Site
Cambridge
CB2 0SR
United Kingdom

Additional identifiers

EudraCT number

ClinicalTrials.gov number

Protocol/serial number

RG58078

Study information

Scientific title

Impact of wine glass size on restaurant wine sales: A replication study

Acronym

Study hypothesis

The size of wine glasses used will alter wine sales in the restaurant, with:
1. 350ml wine glasses increasing sales compared with 290ml wine glasses
2. 450ml wine glasses increasing sales compared with 290ml wine glasses
3. 450ml wine glasses increasing sales compared with 350ml wine glasses

Ethics approval

University of Cambridge Research Ethics Committee (Pre.2017.035), approved 9/5/17

Study design

A multiple treatment reversal design will be used, to alter the size of wine glasses in one restaurant. The study will comprise thirteen sequential periods lasting two weeks: A (290ml glasses); B (350ml glasses); A (290ml glasses); C (450ml glasses); A (290ml glasses); B (350ml glasses); A (290ml glasses); C (450ml glasses); A (290ml glasses); B (350ml glasses); A (290ml glasses); C (450ml glasses); A (290ml glasses)

Primary study design

Other

Secondary study design

Trial setting

Other

Trial type

Other

Patient information sheet

No participant information sheet available

Condition

Alcohol consumption

Intervention

The size of the wine glass in which all portions of wine served in the restaurant is altered over fortnightly periods. Portion size is not altered. Three different wine glass sizes is used: 290ml, 350ml or 450ml. The 350ml and 450ml is used for a total of 6 weeks each, while the 290ml reference glass is used for a total of 14 weeks. The study comprises thirteen sequential periods lasting two weeks (i.e. 26 weeks in total): A (290ml glasses); B (350ml glasses); A (290ml glasses); C (450ml glasses); A (290ml glasses); B (350ml glasses); A (290ml glasses); C (450ml glasses); A (290ml glasses); B (350ml glasses); A (290ml glasses); C (450ml glasses); A (290ml glasses).

Intervention type

Behavioural

Phase

Drug names

Primary outcome measures

Daily volume (ml) of wine purchased throughout the 26 weeks of the study is obtained from the restaurant’s till records

Secondary outcome measures

None planned

Overall trial start date

01/02/2018

Overall trial end date

31/12/2018

Reason abandoned

Eligibility

Participant inclusion criteria

One restaurant in Cambridge, UK, that has previously participated in a study following the same study design

Participant type

Other

Age group

Adult

Gender

Both

Target number of participants

One independent restaurant

Participant exclusion criteria

N/A

Recruitment start date

01/03/2018

Recruitment end date

31/03/2018

Locations

Countries of recruitment

United Kingdom

Trial participating centre

Behaviour and Health Research Unit
University of Cambridge
Cambridge
CB2 0SR
United Kingdom

Sponsor information

Organisation

University of Cambridge

Sponsor details

16 Mill Lane
Cambridge
CB2 1SB
United Kingdom

Sponsor type

University/education

Website

Funders

Funder type

Not defined

Funder name

Department of Health Policy Research Programme (Policy Research Unit in Behaviour and Health [PR-UN-0409-10109])

Alternative name(s)

Funding Body Type

Funding Body Subtype

Location

Results and Publications

Publication and dissemination plan

1. Planned submission of the main results of this study for publication in peer-reviewed journal
2. Presentation of results at academic conferences
3. Dissemination of the results to the public, policy makers and other researchers through targeted social media

IPD sharing statement:
The datasets generated during and/or analysed during the current study are not expected to be made available because they are commercially sensitive and provided on condition that they are not shared beyond the research team

Intention to publish date

01/09/2019

Participant level data

Not expected to be available

Results - basic reporting

Publication summary

Publication citations

Additional files

Editorial Notes