Table 4 Per cent BOLD signal change and F statistic results in the VOIs for the verbal and non-verbal working memory tasks

VOI	Anatomical location (x y z stereotaxic coordinate)	Mean BOLD change (%)			F statistic	p Value
VOI	Anatomical location (x y z stereotaxic coordinate)	Low PCS group 1	Moderate PCS group 2	Control group 3	F statistic	p Value
	Verbal working memory
VOI 1	Left middle frontal gyrus (−38 42 16)	0.230	−0.033*	0.366	4.069	0.03
VOI 2	Right middle frontal gyrus (36 36 22)	0.010*	0.007*	0.480	8.545	0.002
VOI 3	Right middle frontal gyrus (36 28 26)	0.135	−0.026*	0.337	4.667	0.02
	Non-verbal working memory
VOI 4	Right middle frontal gyrus (34 38 18)	0.029*	0.116*	0.431	7.029	0.004
VOI 5	Left middle frontal gyrus (−36 34 18)	0.239	−0.038*	0.265	3.497	0.05

BOLD, blood oxygen level dependent; PCS, post concussive symptoms; VOI, volume of interest.
*Significantly different from control group 3 (p<0.05).