Condition category
Not Applicable
Date applied
10/05/2018
Date assigned
11/05/2018
Last edited
10/05/2018
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 this study is to try to replicate an effect of glass size on purchasing, testing this effect in two bars serving large (250ml) portion sizes of wine by the glass.

Who can participate?
This study takes place in two bars (both belonging to the same chain of bars), one of which 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 nine periods, each lasting two weeks, starting in May 2018. The study measures the effect glass size has on the wine volume (in ml) sold per day in the bars.

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?
The study is being run by the 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?
March 2018 to February 2019

Who is funding the study?
National Institute for Health Research Policy Research Programme (UK)

Who is the main contact?
Dr Rachel Pechey

Trial website

Contact information

Type

Scientific

Primary contact

Dr Rachel Pechey

ORCID ID

Contact details

Institute of Public Health
University Forvie Site
Robinson Way
Cambridge
CB2 0SR
United Kingdom

Additional identifiers

EudraCT number

ClinicalTrials.gov number

Protocol/serial number

RG58078_2

Study information

Scientific title

Does size of wine glasses impact on wine sales? A replication study in bars serving 250ml portions

Acronym

Study hypothesis

The size of wine glasses used alters wine sales in bars, with:
a) 350ml wine glasses increasing sales compared with 290ml wine glasses
b) 450ml wine glasses increasing sales compared with 290ml wine glasses
c) 450ml wine glasses increasing sales compared with 350ml wine glasses

Ethics approval

University of Cambridge Research Ethics Committee, 09/05/2017, ref: Pre.2017.035

Study design

Multiple treatment reversal design

Primary study design

Interventional

Secondary study design

Non randomised study

Trial setting

Other

Trial type

Other

Patient information sheet

Not available in web format, please use the contact details to request a patient information sheet

Condition

Alcohol consumption

Intervention

The size of the wine glass in which all portions of wine served in the restaurant will be altered over fortnightly periods. Portion size will not be altered. Three different wine glass sizes will be used: 290ml, 350ml or 450ml. The study will comprise nine sequential periods lasting two weeks, alternating 350ml glasses (reference glass size) with either larger (450ml) or smaller (290ml) glasses of the same glass design (i.e. the 290ml and 450ml will be used for a total of 4 weeks each, while the 350ml reference glass will be used for a total of 10 weeks).

Intervention type

Behavioural

Phase

Drug names

Primary outcome measure

Daily volume (ml) of wine purchased throughout the 18 weeks of the study, obtained from the bars' till records

Secondary outcome measures

No secondary outcome measures

Overall trial start date

01/03/2018

Overall trial end date

28/02/2019

Reason abandoned (if study stopped)

Eligibility

Participant inclusion criteria

Two bars in Cambridge, UK. One of these bars has previously participated in a study following the same study design, and the other bar is part of the same chain of bars.

Participant type

Other

Age group

Adult

Gender

Both

Target number of participants

Two bars belonging to the same chain

Participant exclusion criteria

Does not meet inclusion criteria

Recruitment start date

10/04/2018

Recruitment end date

10/05/2018

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

Government

Funder name

National Institute for Health Research Policy Research Programme

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

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes