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Table 1: Study sample characteristics
Boys (n = 26) Girls (n = 25) Total (n = 51)
Mean SD Mean SD Mean SD
Age (yr) 12.0 3.9 12.6 3.3 12.3 3.6
SES 45.9 11.3 42.9 13.3 44.5 12.2
Estimated IQ 139 31 142 27 141 29
Neuropsychological test scores 
    Purdue Pegboard RH 12.7 2.1 13.3 2.3 13.0 2.2
    Purdue Pegboard LH 11.9 2.5 13.3 2.6 12.6 2.6
    SB-IV “Bead Memory” 22.8 4.9 24.4 5.4 23.6 5.2
    WJ-III “Auditory Working Memory” 21.1 9.1 22.5 6.1 21.8 7.8
    WJ-III “Retrieval Fluency” 56.1 15.1 67.4^* 17.1 61.9 16.9
NAA/Cr 
    Frontal GM R 2.1 0.5 2.1 0.4 2.1 0.5
L 2.2 0.4 2.0 0.3 2.1 0.3
    Frontal WM R 2.5 0.3 2.5 0.3 2.5 0.3
L 2.4 0.3 2.4 0.3 2.4 0.3
    Parietal GM R 2.1 0.2 2.1 0.2 2.1 0.2
L 2.1 0.2 2.1 0.2 2.1 0.2
    Parietal WM R 2.5 0.4 2.6 0.3 2.5 0.4
L 2.3 0.3 2.5 0.2 2.4 0.3
Note:—R indicates right; L, left;LH, left hand; RH, right hand; WM, white matter; GM, gray matter; SES, socioeconomic status; NAA/Cr, N-acetylaspartate/creatine ratio.
* Girls had higher scores on the WJ-III “Retrieval Fluency” test (P < .05).