To what extent are travelling and alcohol purchases underreported in general population surveys?: - a comparison of self-reports with recorded data
2008 (English)Conference paper (Other (popular science, discussion, etc.))
Background: Unrecorded alcohol has increased in the Nordic countries during recent years, above all in terms of travellers’ imports as a result increasing travellers’ allowances. In Sweden, traveller’s imports accounted for 9% of total consumption in 1994 but 20 per cent in 2006. This implies that trends and levels of per capita consumption would look different without estimates of this source of alcohol, which in Sweden is conducted by surveys. Aim: The overall aim is to analyse the validity of Swedish survey estimates of travellers’ imports and possibly to develop weights to apply on survey estimates. Data and method: The analysis consists of comparing self-reported purchases of spirits, wine, cider and beer at Systembolaget with recorded sales and comparisons of self-reported travelling abroad with official statistics on travelling abroad. Data on self-reported travelling and purchases at Systembolaget were obtained from a Swedish monthly alcohol survey conducted in 2007. Recorded data were obtained from Systembolaget and various statistical reports about travelling for the same year. Findings: Fully 90 per cent of the recorded amount of purchases at Systembolaget was reported in the survey to be compared with the 40-60 per cent usually found for self-reported consumption. Significant differences across beverages were revealed with a lower coverage rate for beer, cider and spirits and higher coverage rate for wine. Different coverage rates were also found for the different ways of travelling with trips by plane and by car via the Öresund bridge being over-reported by 20-40 per cent whereas arrivals by ferries were underreported by 25 per cent. Conclusions: These results are relevant for discussions about if and how survey estimates of travellers’ imports should be adjusted for underreporting. It seems that different weights should be put on different beverages as well as different types of trips, but further analyses are needed to produce more specific recommendations.
Place, publisher, year, edition, pages
2008. 10- p.
IdentifiersURN: urn:nbn:se:su:diva-18049OAI: oai:DiVA.org:su-18049DiVA: diva2:184571
Paper presented at the 34th Annual Alcohol Epidemiology Symposium of the Kettil Bruun Society, Victoria, BC, Canada, 2-6 June, 2008.2009-01-232009-01-23Bibliographically approved