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. 2010 Oct 26;5(10):e13642. doi: 10.1371/journal.pone.0013642

Table 2. Group differences in brain volume measures.

Caucasian (Nā€Š=ā€Š44) African-American (Nā€Š=ā€Š25) 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.