Low Dopamine D2/D3 Receptor Availability is Associated with Steep Discounting of Delayed Rewards in Methamphetamine Dependence.

After controlling for task format, the group difference in discounting reached statistical significance ( F 1,51 = 3.70, p = 0.030, η p 2 = 0.068); the group difference was nearly significant when the two MA users who met criteria for cannabis dependence were excluded from analyses ( F 1,49 = 2.81, p = 0.050, η p 2 = 0.054).

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