Prevalences of drug misusers and their consumptions.

<p>30-day-prevalence (30), 6-months-prevalence (6) and 12-months-prevalence (12) of drug consumption regarding differences in group and consumption order (results in percentage).</p

EEG subbands of Alpha and Theta activities in regard to drug consumption order.

<p>Histogram of spectral power by electroencephalographic frequency in 1.0 Hz steps within the Theta-band, and in 0.5 Hz steps within the Alpha-band, according to groups of polydrug-users with and without Ecstasy consumption and drug naives, in a study cohort of 146 polydrug-users and 11 drug naives as controls.</p