The results also indicate that the strength of underlying reasons for use of illicit drugs is something to consider while assessing why drugs are used as there is a difference between groups, and ADHD symptoms seem to have a greater effect as the use becomes more persistent.
Niðurstöður bentu einnig til þess að styrkur undirliggjandi ástæðna fyrir notkun ólöglegra lyfja sé mismunandi á milli hópa, og að ADHD einkenni hafi meiri áhrif eftir því sem notkun verður þrálátari.