The Effect of Glass Shape on Alcohol Consumption in a Naturalistic Setting: A Feasibility Study
BACKGROUND:
Alcohol-related
harms are a major public health concern, and population-level interventions are
needed to reduce excessive alcohol consumption. Glass shape is an easily
modifiable target for public health intervention. Laboratory findings show beer
is consumed slower from a straight glass compared to a curved glass, but these
findings have not been replicated in a naturalistic setting. The purpose of
this study is to investigate the feasibility of conducting a randomised
controlled trial investigating the effect of glass shape on alcohol consumption
in public houses.
METHODS:
Straight
and curved half-pint and pint glasses were delivered to three public houses
over two weekends. Glass type was counterbalanced over the two weekends and
between the public houses. Monetary takings were recorded as an indirect
measure of consumption.
RESULTS:
Replacing
stocks of glassware in public houses was feasible and can be enacted in a short
space of time. One landlord found the study too disruptive, possibly due to a
laborious exchange of glassware and complaints about the new glassware from
some customers. One public house's dishwasher could not accommodate the
supplied curved full-pint glasses. Obtaining monetary takings from public house
staff was a feasible and efficient way of measuring consumption, although
reporting absolute amounts may be commercially sensitive. Monetary takings were
reduced by 24 % (95 % confidence interval 77 % reduction to 29 % increase) when
straight glasses were used compared to curved glasses.
CONCLUSIONS:
This
study shows that it is feasible to carry out a trial investigating glass shape
in a naturalistic environment, although a number of challenges were
encountered. Brewery owners and landlords are willing to engage with public
health research in settings where alcohol is consumed, such as public houses.
Good communication with stakeholders was vital to acquire good data, and
highlighting the potential commercial benefits of participating was vital to
the study's success. A full scale evaluation of the effects of glass shape on
alcohol consumption could inform local and national policy.
Below: Shapes of glasses. a Sahm’s
Tokyo glass, pint glass: Art. Nr. 1005428 and half-pint glass: Art. Nr.
1005930. b Arcoroc’s
Geo glass 20 oz (58.5 cl) glass. c Paşabahçe’s highball long
drinking glass can hold 285 cc, 9.5 oz (US) and 10.25 oz (UK)
- 1MRC Integrative Epidemiology Unit (IEU), University of Bristol, Bristol, UK ; UK Centre for Tobacco and Alcohol Studies, School of Experimental Psychology, University of Bristol, 12a Priory Road, Bristol BS8 1TU, UK.
- 2School of Social and Community Medicine, University of Bristol, Bristol, UK.
- Pilot Feasibility Stud. 2015 Dec 1;1(1):27.
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