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. Author manuscript; available in PMC: 2017 Aug 1.
Published in final edited form as: Dev Neuropsychol. 2012;37(5):434–452. doi: 10.1080/87565641.2012.661816

TABLE 2. Volumetric and Asymmetry Quotient Data.

Means and standard deviations (SD) for volumes (total, gray, white) and asymmetry quotients (AQ) are shown for all measures. Hemisphere volumes are expressed in cm3 and prefrontal and parietal-occipital volumes are expressed as percent of hemisphere. p-values for group and group × hemisphere (G × H) interactions are shown for volumes, and p-values for group are shown for AQs.

Left Hemisphere
Right Hemisphere
Asymmetry Quotient
Fluent
BWS
Fluent
BWS
Fluent
BWS
Region Subregion Brain Matter Mean SD Mean SD Mean SD Mean SD PGroup PG × H Mean SD Mean SD PGroup
Hemisphere Total 599.85 46.43 631.33 43.79 606.77 49.60 640.14 43.21 n/s n/s −0.01 0.01 −0.01 0.02 n/s
Gray 381.14 27.18 392.49 32.53 384.90 30.25 398.94 31.48 n/s n/s −0.01 0.03 −0.02 0.03 n/s
White 218.71 23.59 238.84 26.58 221.87 24.77 241.20 23.81 0.043 n/s −0.01 0.04 −0.01 0.03 n/s
Prefrontal % Total 14.30 1.22 14.09 1.21 15.43 1.25 14.32 1.32 n/s 0.008 −0.08 0.06 −0.02 0.07 0.021
Gray 9.96 0.74 9.62 0.97 10.58 0.80 9.68 1.03 n/s 0.014 −0.07 0.06 −0.02 0.06 0.040
White 4.34 0.57 4.47 0.57 4.85 0.59 4.64 0.61 n/s 0.031 −0.12 0.09 −0.05 0.10 0.045
Superior Gray 5.77 0.46 5.66 0.64 6.13 0.45 5.82 0.74 n/s n/s −0.06 0.06 −0.03 0.06 n/s
White 2.44 0.37 2.45 0.43 2.74 0.35 2.57 0.49 n/s n/s −0.12 0.11 −0.05 0.14 n/s
Inferior Gray 4.19 0.43 3.97 0.46 4.44 0.57 3.87 0.46 0.024 0.014 −0.06 0.11 0.03 0.07 0.027
White 1.90 0.25 2.02 0.29 2.11 0.35 2.06 0.24 n/s n/s −0.10 0.14 −0.02 0.10 n/s
Parietal-Occipital % Total 31.99 2.74 30.27 1.83 30.20 3.13 29.94 1.42 n/s n/s 0.06 0.06 0.01 0.07 0.045
Gray 21.10 1.91 19.23 1.46 20.26 2.22 19.56 1.10 --- --- 0.03 0.06 −0.03 0.07 0.015
White 10.89 1.04 11.04 1.04 9.94 1.62 10.38 0.87 --- --- 0.09 0.10 0.05 0.09 n/s
Superior Gray 11.35 0.85 10.32 1.43 10.96 1.42 10.59 1.33 --- --- 0.03 0.08 −0.03 0.08 0.028
White 5.84 0.54 5.55 0.94 5.55 1.15 5.54 0.79 --- --- 0.60 0.13 −0.02 0.11 ---
Inferior Gray 9.75 1.28 8.91 0.84 9.30 1.39 8.97 0.87 --- --- 0.05 0.09 −0.01 0.09 n/s
White 5.05 0.81 5.49 0.72 4.39 0.86 4.84 0.86 --- --- 0.13 0.15 0.12 0.12 ---

BWS = boys who stutter, n/s = nonsignificant, --- = not analyzed due to Type I error control.