Demographic characteristics, EPQ-R scores, and use of other recreational drugs.

Standard deviation in parentheses. Ns, Non-significant difference; Raven IQ, IQ measured by means of the Raven Progressive Matrices; Monthly drinks, monthly number of standard alcoholic drinks; Monthly cigarettes, monthly standard cigarettes smoked; Lifetime exposure cannabis, lifetime consumption of joints; Lifetime exposure MDMA, lifetime consumption of MDMA (ecstasy) tablets; Personality traits measured by means of the Eysenck Personality Questionnaire Revised Short Scale.**p括号内为标准差（Standard Deviation）。Ns 代表无显著性差异（Non-significant difference）；瑞文IQ（Raven IQ）：通过瑞文推理测验（Raven Progressive Matrices）测得的智商；月均饮酒量：每月标准饮酒单位数；月均吸烟量：每月吸食的标准卷烟数；终身大麻暴露量：终身吸食大麻烟卷的量；终身MDMA暴露量：终身服用MDMA（ecstasy，摇头丸）片剂的量；人格特质通过艾森克人格问卷简式修订版（Eysenck Personality Questionnaire Revised Short Scale）测得。**p