Descriptive statistics of subjects (<i>n</i> = 261).

Note. THC = Tetrahydrocannabinol; ZKPQ = Zuckerman-Kuhlman Personality Questionnaire; TAS = Tellegen Absorption Scale; SCL-90-R = Symptom Check-List-90-Revised. aMeans standard deviations and frequencies are shown for continuous and categorical variables, respectively. Numbers in parenthesis indicate absolute frequencies. bExperience of a classical hallucinogen at least once in a lifetime previous to the first experimental day. cLess than once per month. d1–10 times per month. eNormed on the Bielefeld-Jena sample (n = 141) of Angleitner et al. [33]. fNormed on the sample of Ritz et al. [36]. gNormed on a German community sample (n = 1006) [40].