The ESPAD validity study in four countries in 2013
Assessing the validity of the information that has been collected is a relevant issue in any study. After the publication of the 2011 ESPAD report and in the view of preparations for the 2015 survey, a review of the questionnaire used to collect the data was conducted. The results of that exercise are presented in the validity study.
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Table of contents
- Goals and data collection
- Summary and conclusions