Table 2.

Group differences in brain volumes compared with retired athletes with rmTBI and HC in Reader 1.

	Volume, cm3, mean ± SD			Regional volume/TBV ratio, × 10−3 mean ± SD
	Retied athletes with rmTBI	HC	p value	Retied athletes with rm TBI	HC	p value
	n = 27	n = 23		n = 27	n = 23
TBV	1.12 ± 0.13 × 103	1.17 ± 0.12 × 103	ns	–	–	–
MB	0.14 ± 0.05	0.22 ± 0.03	< 0.001**	0.13 ± 0.05	0.19 ± 0.03	< 0.001**
Put	11.0 ± 1.55	11.2 ± 1.24	ns	9.85 ± 1.11	9.61 ± 0.86	ns
GP	3.18 ± 0.43	3.14 ± 0.48	ns	2.87 ± 0.44	2.70 ± 0.44	ns
CN	8.65 ± 1.37	9.30 ± 1.14	ns	7.74 ± 0.79	7.94 ± 0.73	ns
Thal	13.6 ± 2.08	14.9 ± 2.01	0.04*	12.2 ± 1.22	12.7 ± 1.25	ns
Hipp	7.41 ± 1.05	7.73 ± 1.10	ns	6.65 ± 0.68	6.61 ± 0.77	ns
Amy	3.89 ± 0.66	4.01 ± 0.55	ns	3.48 ± 0.45	3.44 ± 0.46	ns
CC	13.9 ± 1.77	15.9 ± 2.32	< 0.001**	12.5 ± 1.63	13.6 ± 1.81	0.03*

rmTBI repetitive mild traumatic brain injury, HC healthy control, SD standard deviation, TBV, total brain volume, ns, not significant, MB mammillary bodies, Put putamina, GP globus pallida, CN caudate nuclei, Thal thalami, Hipp hippocampi, Amy amygdalae, CC corpus callosum **p < 0.006, *p < 0.05.