No substance | 1.2 % (n = 2) |
Ginkgo biloba | 4.8 % (n = 8) |
Energy drinks | 19.6 % (n = 33) |
Caffeine tablets | 33.3 % (n = 56) |
MPH | 51.8 % (n = 87) |
AMPH | 42.9 % (n = 72) |
Atomoxetin | 32.1 % (n = 54) |
Modafinil | 30.4 % (n = 51) |
Antidementia drugs | 33.3 % (n = 56) |
Illicit AMPH | 86.9 % (n = 146) |
Ecstasy/ MDMA | 88.7 % (n = 149) |
Cocaine | 95.8 % (n = 161) |
Ephedrin | 74.4 % (n = 125) |
Cannabis | 82.7 % (n = 139) |