Descriptive statistics of subjects (n = 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].