Table 2: Means and standard deviations of use frequency, and participants’ lifetime history with drug use.

Synthetic Substances/Hallucinogens (1, 5) M SD % N
MDMA 4.35 0.7 100 37
Speed 4.31 0.8 94.6 35
Ketamine 4.30 0.8 73.0 27
LSD 3.86 0.10 91.9 34
Mephedrone 3.17 1.15 48.6 18
Psilocybin 2.50 1.07 70.3 26
1=never; 5=daily