Who under-reports their alcohol consumption in telephone surveys and by how much? An application of the ‘yesterday method’ in a national Canadian substance use survey
Version of Record online: 19 JUN 2014
© 2014 Society for the Study of Addiction
Volume 109, Issue 10, pages 1657–1666, October 2014
How to Cite
Stockwell, T., Zhao, J. and Macdonald, S. (2014), Who under-reports their alcohol consumption in telephone surveys and by how much? An application of the ‘yesterday method’ in a national Canadian substance use survey. Addiction, 109: 1657–1666. doi: 10.1111/add.12609
- Issue online: 27 AUG 2014
- Version of Record online: 19 JUN 2014
- Accepted manuscript online: 13 MAY 2014 09:21PM EST
- Manuscript Accepted: 30 APR 2014
- Manuscript Revised: 15 NOV 2013
- Manuscript Received: 25 JUL 2013
- University of Victoria
- alcohol surveys;
- quantity–frequency method;
- yesterday method.
Background and Aims
Adjustments for under-reporting in alcohol surveys have been used in epidemiological and policy studies which assume that all drinkers underestimate their consumption equally. This study aims to describe a method of estimating how under-reporting of alcohol consumption might vary by age, gender and consumption level.
The Canadian Alcohol and Drug Use Monitoring Survey (CADUMS) 2008–10 (n = 43 371) asks about beverage-specific ‘yesterday’ consumption (BSY) and quantity–frequency (QF). Observed drinking frequencies for different age and gender groups were calculated from BSY and used to correct values of F in QF. Beverage-specific correction factors for quantity (Q) were calculated by comparing consumption estimated from BSY with sales data.
Drinking frequency was underestimated by males (Z = 24.62, P < 0.001) and females (Z = 17.46, P < 0.001) in the QF as assessed by comparing with frequency and quantity of yesterday drinking. Spirits consumption was underestimated by 65.94% compared with sales data, wine by 38.35% and beer by 49.02%. After adjusting Q and F values accordingly, regression analysis found alcohol consumption to be underestimated significantly more by younger drinkers (e.g. 82.9 ± 1.19% for underage drinkers versus 70.38 ± 1.54% for those 65+, P < 0.001) and by low-risk more than high-risk drinkers (76.25 ± 0.34% versus 49.22 ± 3.01%, P < 0.001). Under-reporting did not differ by gender.
Alcohol consumption surveys can use the beverage-specific ‘yesterday method’ to correct for under-reporting of consumption among subgroups. Alcohol consumption among Canadians appears to be under-reported to an equal degree by men and women. Younger drinkers under-report alcohol consumption to a greater degree than do older drinkers, while low-risk drinkers underestimate more than do medium and high-risk drinkers.