Table 2. Group differences in brain volume measures.

	Caucasian (N = 44)	African-American (N = 25)	F value	p value
Total Cerebrum	1178.3 (115.0)	1076.0 (67.9)	17.92	<0.0001
GM+WM/CSF Ratio	667.3 (81.8)	629.8 (54.8)	13.77	0.0004
Lateral Ventricles	21.6 (10.9)	15.2 (5.0)	0.04	0.8503
	0.018 (0.009)	0.014 (0.004)	1.30	0.2585
Total Gray Matter	665.2 (81.7)	627.2 (54.5)	3.13	0.0816
	0.566 (0.061)	0.583 (0.048)	0.52	0.4752
Total White Matter	444.7 (79.5)	429.6 (62.1)	2.19	0.1438
	0.377 (0.054)	0.398 (0.044)	1.79	0.1856
Amygdala, L	2.4 (0.5)	2.2 (0.5)	1.31	0.2568
	0.0021 (0.0004)	0.0021 (0.0003)	3.65	0.0607
Amygdala, R	2.4 (0.4)	2.2 (0.4)	1.96	0.1668
	0.0020 (0.0004)	0.0021 (0.0004)	6.05	0.0167
Caudate, L	4.0 (0.7)	3.8 (0.5)	1.93	0.1700
	0.0034 (0.0006)	0.0036 (0.0005)	0.19	0.6676
Caudate, R	4.4 (0.7)	4.1 (0.6)	2.64	0.1092
	0.0037 (0.0006)	0.0040 (0.0005)	0.51	0.4771
Hippocampus, L	3.6 (0.5)	3.5 (0.5)	1.34	0.2513
	0.0031 (0.0005)	0.0032 (0.0004)	0.00	0.9510
Hippocampus, R	3.5 (0.5)	3.5 (0.5)	0.01	0.9245
	0.0030 (0.0005)	0.0033 (0.0005)	1.31	0.2561
Orbitofrontal Cortex, L	6.8 (1.9)	7.8 (1.7)	7.50	0.0080
	0.0057 (0.0014)	0.0072 (0.0016)	10.79	0.0017
Orbitofrontal Cortex, R	7.6 (1.6)	8.3 (1.7)	3.38	0.0708
	0.0065 (0.001)	0.0077 (0.002)	7.10	0.0098

The top measure for each region is the mean volume (mLs) and the bottom measure is the ratio of regional volume/cerebrum (defined as GM+WM+CSF). Standard deviation is in parentheses. Each variable has 1 df, with 68 df for each model.