Does size of wine glasses impact on wine sales? A replication study in bars serving 250ml portions
| ISRCTN | ISRCTN39401124 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN39401124 |
| Protocol serial number | RG58078_2 |
| Sponsor | University of Cambridge |
| Funder | National Institute for Health Research Policy Research Programme |
- Submission date
- 10/05/2018
- Registration date
- 11/05/2018
- Last edited
- 19/07/2019
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Other
Plain English summary of protocol
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
Contact information
Scientific
Institute of Public Health
University Forvie Site
Robinson Way
Cambridge
CB2 0SR
United Kingdom
Study information
| Primary study design | Interventional |
|---|---|
| Study design | Multiple treatment reversal design |
| Secondary study design | Non randomised study |
| Study type | Participant information sheet |
| Scientific title | Does size of wine glasses impact on wine sales? A replication study in bars serving 250ml portions |
| Study objectives | 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(s) | University of Cambridge Research Ethics Committee, 09/05/2017, ref: Pre.2017.035 |
| Health condition(s) or problem(s) studied | 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 |
| Primary outcome measure(s) |
Daily volume (ml) of wine purchased throughout the 18 weeks of the study, obtained from the bars' till records |
| Key secondary outcome measure(s) |
No secondary outcome measures |
| Completion date | 28/02/2019 |
Eligibility
| Participant type(s) | Other |
|---|---|
| Age group | Adult |
| Sex | All |
| Target sample size at registration | 2 |
| Key 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. |
| Key exclusion criteria | Does not meet inclusion criteria |
| Date of first enrolment | 10/04/2018 |
| Date of final enrolment | 10/05/2018 |
Locations
Countries of recruitment
- United Kingdom
- England
Study participating centre
Cambridge
CB2 0SR
United Kingdom
Results and Publications
| Individual participant data (IPD) Intention to share | No |
|---|---|
| IPD sharing plan summary | Not expected to be made available |
| IPD sharing plan | 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. |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Results article | results | 17/07/2019 | 19/07/2019 | Yes | No |
| Participant information sheet | Participant information sheet | 11/11/2025 | 11/11/2025 | No | Yes |
Editorial Notes
19/07/2019: Publication reference added.
