Table III.

Group comparisons of IFG and VStr beta values

	ADHD N = 19 mean (SD)	Controls N = 19 mean (SD)	F statistic df [3,34]	P value
Inhibition control (NOGO>GO)
Left inferior frontal gyrus	−0.01 (0.37)	−0.04 (0.42)	0.034	0.991
Right inferior frontal gyrus	0.25 (0.57)	0.33 (0.42)	0.387	0.763
Reward Anticipation (WIN>CONTROL)
Left ventral striatum	0.59 (1.41)	2.20 (2.69)	4.38	0.010
Right ventral striatum	0.79 (1.71)	2.29 (2.15)	3.72	0.020

This table shows the results of group comparisons of the beta values extracted from the inferior frontal gyrus and the ventral striatum during response inhibition and reward anticipation tasks respectively. Estimated IQ and age were introduced in the model as nuisance covariates. Variables are expressed by their mean and their standard deviation (SD). Boldface values indicate which group comparisons survive Bonferroni correction (P = 0.012).