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
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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. Method: 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. Results: 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. Conclusions: 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.
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Estimating under- and over-reporting of drinking in national surveys of alcohol consumption: identification of consistent biases across four English-speaking countriesStockwell, Tim; Zhao, J.; Greenfield, T.; Li, J.; Livingston, M.; Meng, Y. (2016)Background and Aims: Questions about drinking ‘yesterday’ have been used to correct under-reporting of typical alcohol consumption in surveys. We use this method to explore patterns of over- and under-reporting of drinking ...
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Underestimation of alcohol consumption in cohort studies and implications for alcohol's contribution to the global burden of diseaseStockwell, Tim; Zhao, J.; Sherk, A.; Rehm, J.; Shield, K.; Naimi, T. (2018)© 2018 Society for the Study of Addiction Background and aims: Estimated alcohol consumption from national self-report surveys is often only 30–40% of official estimates based on sales or taxation data. Global burden of ...