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
Does size of wine glasses impact on wine sales? A replication study in bars serving 250ml portions
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
University of Cambridge Research Ethics Committee, 09/05/2017, ref: Pre.2017.035
Multiple treatment reversal design
Primary study design
Secondary study design
Non randomised study
Patient information sheet
Not available in web format, please use the contact details to request a patient information sheet
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).
Primary outcome measures
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
Overall trial end date
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.
Target number of participants
Two bars belonging to the same chain
Participant exclusion criteria
Does not meet inclusion criteria
Recruitment start date
Recruitment end date
Countries of recruitment
Trial participating centre
Behaviour and Health Research Unit
University of Cambridge
National Institute for Health Research Policy Research Programme
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