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Table 2: Within-group comparisons of hemispheric caudate nucleus volume*
Groups Caudate Volume t-Value df Sig Eta-Squared
R (SD) R (SEM) L (SD) L (SEM)
C (n = 27) 3.976 (0.435) 0.083 3.772 (0.426) 0.082 4.527 26 .000^† .441
AD (n = 19) 3.674 (0.595) 0.137 3.551 (0.487) 0.112 1.219 18 .239 
FTD (n = 12) 3.055 (0.811) 0.234 2.819 (0.524) 0.151 1.200 11 .255 
SD (n = 13) 3.698 (0.565) 0.157 3.503 (0.598) 0.166 1.572 12 .142 
PNFA (n = 9) 3.323 (0.601) 0.200 2.695 (0.539) 0.179 4.282 8 .003^† .668
Note:—C indicates control; R, right; L, left; SD (header), standard deviation; df, degrees of freedom; Sig, significance (2-tailed); SD (column 1), semantic dementia; SEM, standard error of the mean; AD, Alzheimer disease; FTD, frontotemporal dementia; PNFA, progressive nonfluent aphasia; Eta-Squared, the sum of squares between groups divided by total sum of squares.
* All volumes are in cubic centimeters.
† Significant at P < .05.