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)
Impact of wine glass size on restaurant wine sales: A replication study
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
University of Cambridge Research Ethics Committee (Pre.2017.035), approved 9/5/17
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
Secondary study design
Patient information sheet
No participant information sheet available
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).
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
Overall trial start date
Overall trial end date
Participant inclusion criteria
One restaurant in Cambridge, UK, that has previously participated in a study following the same study design
Target number of participants
One independent restaurant
Participant exclusion criteria
Recruitment start date
Recruitment end date
Countries of recruitment
Trial participating centre
Behaviour and Health Research Unit
University of Cambridge
Department of Health Policy Research Programme (Policy Research Unit in Behaviour and Health [PR-UN-0409-10109])
Funding Body Type
Funding Body Subtype
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
Participant level data
Not expected to be available
Results - basic reporting