gmail.com.2European Monitoring Centre for Drugs and Drug Addiction (EMCDDA), Praça Europa 1, Cais do Sodré, 1249-289 Lisbon, Portugal.3Department of Addictology, First Faculty of Medicine, Charles University and General University Hospital in Prague, Apolinarska 4, 128 00 Praha 2, Czech Republic; National Monitoring Centre for Drugs and Addiction, Office of the Government, nábřeží Edvarda Beneše 4, 118 01 Prague 1, Czech Republic; National Institute of Mental Health, Topolová 748, 250 67 Klecany, Czech Republic.AbstractBACKGROUND:

The European Web Survey on Drugs aimed to obtain in-depth data on consumption of cannabis, ecstasy/MDMA, cocaine, and amphetamines in different populations of drug users in 16 European countries. This paper examines test-retest reliability, the consistency and the comprehensibility of the prevalence and frequency of use questions in the Czech part of the survey.

METHODS:

A baseline web survey was performed (N 

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