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Serum concentrations of catecholaminergic neurotransmitters in the predominately hyperactive presentation between the case and control groups.
| Neurotransmitters | Case (n = 60, mean ± SD) | Control (n = 60, mean ± SD) | t | P |
| Dopamine (ng/mL) | 1.51 ± 0.51 | 2.14 ± 0.47 | 2.32 | <.05 |
| Noradrenalin (pg/mL) | 187.50 ± 30.57 | 240.57 ± 49.87 | 2.26 | <.05 |
