The effect of wine glass size on volume of wine sold: a mega-analysis of studies in bars and restaurants.
Addiction (Abingdon, England)
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Pilling, M., Clarke, N., Pechey, R., Hollands, G., & Marteau, T. (2020). The effect of wine glass size on volume of wine sold: a mega-analysis of studies in bars and restaurants.. Addiction (Abingdon, England), 115 (9), 1660-1667. https://doi.org/10.1111/add.14998
Aim: To estimate the effects of wine glass size on volume of wine sold in bars and restaurants. Design: A mega-analysis combining raw (as opposed to aggregate-level) data from eight studies conducted in five establishments. For each dataset, a multiple treatment reversal design was used, with wine glass size changed fortnightly whilst serving sizes were unaffected, in studies lasting between 14 and 26 weeks Setting and participants: Five bars and restaurants in England participated in studies between 2015 and 2018, using wine glasses of five sizes: 250ml, 300ml, 370ml, 450ml and 510ml, with the largest size only used in bars. Measurements: Daily volume of wine sold by the glass, bottle or carafe for non-sparkling wine were recorded at bars (594 days) and restaurants (427 days), averaging four months per study. Findings: Mega-analysis combining data from bars did not find a significant effect of glass size on volume of wine sold compared with 300ml glasses: the volume of wine sold using 370ml glasses was 0.5% lower (95%CI -8.1% to 6.1%), using 450ml glasses was 1.0% higher (95%CI -9.1 to 12.2), and using 510ml glasses was 0.4% lower (95% CI -9.4 to 9.4). For restaurants, compared with 300ml glasses, the volume of wine sold using 250ml glasses did not show a significant difference: 9.6% lower (95% CI -19.0 to 7.2). Using 370ml glasses the volume of wine sold was 7.3% higher (95%CI 1.5% to 13.5%); no significant effect was found using 450ml glasses: 0.9% higher (95%CI -5.5 to 7.7). Conclusions: The volume of wine sold in restaurants in England may be greater when 370ml glasses are used, compared with 300ml wine glasses, but may not be in bars. This might be related to restaurants compared with bars selling more wine in bottles and carafes, which require free-pouring.
Humans, Alcohol Drinking, Restaurants, Wine, England, Portion Size
Department of Health (PRP number 107001)
Department of Health (via National Institute for Health Research (NIHR)) (unknown)
Wellcome Trust (206853/Z/17/Z)
WELLCOME TRUST (106679/Z/14/Z)
External DOI: https://doi.org/10.1111/add.14998
This record's URL: https://www.repository.cam.ac.uk/handle/1810/301533
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