The 2013 ESPAD Validity Study

A basic question in most research projects is whether you really measure what you want to measure — in other words, whether the validity is sufficient. This report presents findings from a study regarding the validity of the ESPAD questionnaire performed in four countries during 2013.

The ESPAD validity study in four countries in 2013 (released July, 2015). 41 pages. (only pdf available)