%0 Journal Article %A Gjerde, Hallvard %A Gjersing, Linn %A Furuhaugen, Håvard %A Bretteville-Jensen, Anne Line %D 2019 %T Correspondence between Oral Fluid Drug Test Results and Self-Reported Illicit Drug Use among Music Festival Attendees %U https://tandf.figshare.com/articles/journal_contribution/Correspondence_between_Oral_Fluid_Drug_Test_Results_and_Self-Reported_Illicit_Drug_Use_among_Music_Festival_Attendees/8109194 %R 10.6084/m9.figshare.8109194.v1 %2 https://tandf.figshare.com/ndownloader/files/15124109 %K Illicit drug use %K self-report %K oral fluid %K drug analysis %K music festivals %X

Background: Use of illicit substances is often under-reported. Testing positive in oral fluid provides an objective confirmation of recent intake. Objectives: To examine the agreement between oral fluid test results and self-reported substance use among music festival attendees, and factors associated with reporting past 48 h drug use among users identified by drug testing. Methods: One thousand three hundred nine participants were recruited from six music festivals in Norway (June–August 2016). They completed a questionnaire and provided oral fluid samples analyzed for amphetamines, MDMA, tetrahydrocannabinol (cannabis), and cocaine. Additionally, their blood alcohol levels were measured. Results: Overall, 5.5% reported use of amphetamines, cannabis, cocaine, and/or MDMA during past 48 h in the questionnaire, whereas 10.8% tested positive in oral fluid. Only 16.7% of identified cocaine users and 31.1% of identified MDMA users reported past 48 h cocaine or MDMA use, respectively. Higher proportions of identified cannabis and amphetamine users reported past 48 h use (53.8% and 55.6%, respectively). Multivariable logistic regression analysis showed that among participants who tested positive, those reporting weekly illicit substance use (Adjusted Odds Ratio [AOR] 30.6; 95% Confidence Interval [CI] 6.3–147.9), and using such substances when younger than 18 years (AOR 5.0; 95% CI 1.9–13.4) were more likely to report past 48 h use. Conclusions/Importance: Oral fluid testing appears to be an important tool when studying illicit substance use among music festival attendees, as significant under-reporting was observed. Among those testing positive, regular, and experienced users were more likely to report recent use, compared to less regular and experienced users.

%I Taylor & Francis