%0 Journal Article
%T The effects of missing data when surveying alcohol habits
%A Peter Wennberg
%A 
%A 
%A Johan Svensson
%A Mats Ramstedt
%J Nordic Studies on Alcohol and Drugs
%@ 1458-6126
%D 2011
%I 
%R 10.2478/v10199-011-0004-5
%X AIMS - This study aimed at describing the effects of missing data when surveying alcohol consumption using a Random Digit Dialling procedure. METHODS - Data was part of the Monitor project including repeated monthly data on the alcohol habits in the general Swedish population. Non-respondents during four months were followed up a year later and asked to do a shortened telephone interview and were compared to a concurrent sample of respondents (n=2552 versus n=6005). Further, using a second approach, the monthly levels of non-response was related to the level of measured alcohol use in a time series analysis (n=67500). RESULTS - The results indicated no differences in the level of reported alcohol or tobacco use with except for a slightly higher proportion of alcohol abstainers in the sample of initial non-response. The time series showed no pattern of co-variation between the obtained nonresponse levels and the assessed levels of alcohol or tobacco use. CONCLUSIONS - On the basis of the results it was meaningful to make a distinction between "soft" non-respondents (responding after extensive contacting effort) and "hard" non-respondents (not responding albeit extensive effort) and the results suggest that inclusion of the "soft" non-respondents does not by necessity lead to higher levels of assessed alcohol use.
%K Missing data
%K Non-response
%K Alcohol
%K Random Digit Dialling
%U http://versita.metapress.com/content/y684w5182v1vv627/?p=846da23b288d4dec977898e5be8e06db&pi=3