Straight-sided glasses for alcohol reduction
| ISRCTN | ISRCTN10456720 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN10456720 |
- Submission date
- 19/11/2019
- Registration date
- 05/12/2019
- Last edited
- 08/11/2022
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Other
Plain English summary of protocol
Background and study aims
In a previous laboratory study, social alcohol drinkers consumed a pint of lager more slowly from a straight-sided glass than from a curved glass. Reduced drinking speed may lead to lower overall alcohol consumption, but this needs to be tested in a real-world setting. The aim of this study is therefore to find out what will happen to people’s alcohol consumption if public houses and bars change the shape of their pint and half pint glasses from curved to straight-sided.
Who can participate?
Twenty-four public houses and bars in the UK will take part in this study. A public house or bar will be able to take part if:
1. It sells more than 160 pints (i.e., 90 litres) of lager, ale and cider per week
2. 75% or more of its usual pint and half pint glasses are curved (i.e., the width of the glass is not consistent from top to bottom)
3. It has an EPOS till system (or an equivalent) to record itemised sales for all drinks
What does the study involve?
All venues will perform two intervention periods (A) and two control periods (B) in a random order: 1) BABA; 2) BAAB; 3) ABBA; or 4) ABAB. During each intervention period, lager, ale and cider will be served in straight-sided pint and half pint glasses for two weeks. During each control period, lager, ale and cider will be served in the venue’s usual (curved) pint and half pint glasses for two weeks. The venues will share their drinks sales data throughout the study and the volume of lager, ale and cider sold will be compared between intervention and control periods.
What are the possible benefits and risks of participating?
Participating public houses and bars will receive an optional financial reimbursement of £500 for taking part in the study, free glasses, and optional publicity. Participating public houses and bars may sell less lager, ale and cider when these drinks are served in straight-sided glasses.
Where is the study run from?
University of Bristol (UK)
When is the study starting and how long is it expected to run for?
March 2018 to November 2019
Who is funding the study?
Wellcome Trust (UK)
Who is the main contact?
Dr Laura Brocklebank
laura.brocklebank@bristol.ac.uk
Contact information
Scientific
School of Psychological Science
University of Bristol
12a Priory Road
Bristol
BS8 1TU
United Kingdom
 ORCID ID |
0000-0002-5928-3143 |
|---|---|
| Phone | +44 (0) 117 928 8011 |
| laura.brocklebank@bristol.ac.uk |
Study information
| Study design | Randomised multi-period crossover trial |
|---|---|
| Primary study design | Interventional |
| Secondary study design | Randomised cross over trial |
| Study setting(s) | Other |
| Study type | Prevention |
| Scientific title | Straight-sided glasses for alcohol reduction: a randomised crossover trial in public houses and bars |
| Study objectives | A lower volume of lager, ale and cider will be sold when public houses and bars serve these alcoholic drinks in straight-sided glasses compared to their usual glasses. |
| Ethics approval(s) | Approved 13/08/2018, Faculty of Science Research Ethics Committee at the University of Bristol (Mr Liam McKervey, Research Governance and Ethics Officer, University of Bristol, 1 Cathedral Square, Bristol, BS1 5DD, UK; Tel: +44 (0) 117 428 4051; Email: liam.mckervey@bristol.ac.uk), ref: 73621 |
| Health condition(s) or problem(s) studied | Excessive alcohol consumption |
| Intervention | All participating venues (n = 24) will perform two intervention periods (A) and two control periods (B) in a random order. The random order for the four periods will be generated at the start of the study using a computer-generated list of random numbers. Blocked randomisation will be used to ensure that an equal number of venues (n = 6) are assigned to each of the four possible orders: 1) BABA; 2) BAAB; 3) ABBA; or 4) ABAB. During the intervention condition, lager, ale and cider will be served in straight-sided pint and half pint glasses for two weeks. These glasses will be provided by the research team. During the control condition, lager, ale and cider will be served in the venue’s usual pint and half pint glasses for two weeks (i.e., usual practice). |
| Intervention type | Behavioural |
| Primary outcome measure | The mean volume (in litres) of draught lager, ale and cider (combined) sold weekly, measured using electronic point of sale (EPOS) till system data during the two intervention periods (i.e., straight-sided glassware) and the two control periods (i.e., usual glassware), with each period lasting two weeks |
| Secondary outcome measures | All secondary outcomes will be measured using EPOS till system data during the two intervention periods and the two control periods: 1. The mean volume (in litres) of lager sold weekly 2. The mean volume (in litres) of ale sold weekly 3. The mean volume (in litres) of cider sold weekly 4. The mean number of bottles of beer sold weekly 5. The mean volume (in litres) of wine sold weekly 6. The mean volume (in litres) of spirits sold weekly 7. The mean number of soft drinks sold weekly 8. The mean number of alcohol-free drinks (excluding soft drinks) sold weekly 9. The mean volume (in litres) of all alcoholic drinks sold weekly |
| Overall study start date | 05/03/2018 |
| Completion date | 11/11/2019 |
Eligibility
| Participant type(s) | All |
|---|---|
| Age group | Adult |
| Sex | Both |
| Target number of participants | A total of 24 public houses and bars |
| Total final enrolment | 24 |
| Key inclusion criteria | The study will not use individual-level data; the unit of randomisation and data collection will be public houses and bars. The inclusion criteria for the public houses and bars are: 1. Sell more than 160 pints (i.e., 90 litres) of lager, ale and cider per week 2. Approximately 75% or more of their usual glasses for lager, ale and cider are curved (i.e., the width of the glass is not consistent from top to bottom) 3. Their licensing conditions will allow them to serve lager, ale and cider in straight-sided pint and half pint glasses during the intervention condition 4. Have an electronic point of sale (EPOS) till system (or an equivalent) to record itemised sales for all drinks, including lager, ale and cider |
| Key exclusion criteria | Public houses and bars not meeting the inclusion criteria |
| Date of first enrolment | 14/09/2018 |
| Date of final enrolment | 11/09/2019 |
Locations
Countries of recruitment
- England
- United Kingdom
Study participating centre
12a Priory Road
Bristol
BS8 1TU
United Kingdom
Sponsor information
University/education
School of Psychological Science
University of Bristol
12a Priory Road
Bristol
BS8 1TU
England
United Kingdom
| Phone | +44 (0)117 92 88450 |
|---|---|
| psych-school@bristol.ac.uk | |
| Website | http://www.bristol.ac.uk/psychology/ |
"ROR" |
https://ror.org/0524sp257 |
Funders
Funder type
Charity
Private sector organisation / International organizations
- Location
- United Kingdom
Results and Publications
| Intention to publish date | 01/02/2020 |
|---|---|
| Individual participant data (IPD) Intention to share | No |
| IPD sharing plan summary | Stored in repository |
| Publication and dissemination plan | The study protocol and the detailed statistical analysis plan are attached. Both of these documents have been published on the Open Science Framework (osf.io/4kurx). The findings from this research study may be published in an appropriate scientific journal (and made available open access) and/or presented at an appropriate meeting. The anonymous study datasheet will be made available for sharing via the University of Bristol Research Data Repository. |
| IPD sharing plan | The study will not use individual-level data: the unit of randomisation, data collection and analysis will be individual public houses and bars. The datasets generated and/or analysed during the current study will be stored in a publically available repository. All study data will be anonymised using a unique numeric identifier. At the appropriate time, the anonymous study datasheet will be locked and deposited on the University of Bristol Research Data Repository. If a publican decides that they do not want their data to be used after their participation they have the right to request that their data are withdrawn from the study. They can request this up to two weeks after study completion or until the data are deposited (whichever comes first). Publicans are made aware of this prior to giving consent to their participation in the study and to the use of their anonymised study data. |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Protocol file | version V1.0 | 24/09/2018 | 05/12/2019 | No | No |
| Statistical Analysis Plan | 14/11/2019 | 05/12/2019 | No | No | |
| Other publications | literature review | 18/11/2020 | 26/01/2021 | Yes | No |
| Results article | 18/04/2021 | 08/11/2022 | Yes | No |
Additional files
- ISRCTN10456720_PROTOCOL_24Sep2018_V1.0.pdf
- Uploaded 05/12/2019
- ISRCTN10456720_SAP_14Nov2019.pdf
- Uploaded 05/12/2019
Editorial Notes
08/11/2022: Publication reference added.
26/01/2021: Publication reference added.
05/12/2019: Uploaded protocol Version 1.0, 24 September 2018 (not peer reviewed). Uploaded statistical analysis plan.
28/11/2019: Trial's existence confirmed by ethics committee.
