I den første undersøgelse blev Neupro sammenlignet med placebo (virkningsløs behandling), og i den anden undersøgelse med ropinirol (en anden dopaminagonist), og placebo.
In the first study, the effectiveness of Neupro was compared with that of placebo (a dummy treatment) and in the second, it was compared with ropinirole (another dopamine agonist) and with placebo.