Table 1   Demographic data of ecstasy users and control groups (n=28 in each group) Ecstasy users Cannabis users* Non-users Mean age (y) (range) 23.25 (18-29) 22.9 (18-31) 23.5 (18-30) Men:women 16:12 15:13 17:11 Level of education (1) No school leaving examination/at least 9 years of education 1 0 0 (2) Basic school leaving examination after form 9 (Hauptschulabschlu) 2 2 0 (3) Intermediate school leaving examination after form 10 (Realschule/ mittlere Reife) 8 5 8 (4) Highest school leaving examination qualifying for admission to college/university after form 12 or 13 (Fachabitur/Abitur) 16 20 20 (5) University degree (Hochschulabschlu) 1 1 0 * Cannabis users=persons who were matched for cannabis use with the ecstasy users.