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. Author manuscript; available in PMC: 2008 Jun 4.
Published in final edited form as: Behav Neurosci. 2008 Jun;122(3):677–684. doi: 10.1037/0735-7044.122.3.677

Table 5.

Extreme group comparison (Boys)

    Low High  
  Measure     Sig
    (n=20) (n =20)  
Age Range 9.00 – 17.92 7.92 – 16.92  
         
  Mean (s.d.) 12.65 (2.77) 11.80 (2.63) .29
         
IQ Mean (s.d.) 114 (14) 112 (17) .50
         
SES Mean (s.d.) 2.16 (.48) 2.38 (.73) .28
         
Handedness   16 RH, 4 LH 18 RH, 2 LH  
         
Impulsivity Rating Range 0 – 9 0 – 27  
         
  Mean (s.d.) 3.85 (2.08) 9.25 (6.06) .01
         
Conduct Rating Range 0 – 3 5 – 24  
         
  Mean (s.d.) 1.65 (1.18) 11.40 (5.64) .000
         
Total Cortex Volume (cc) Mean volume (s.d) 502.76 (3.54) 515.17 (8.66) .29
         
R ACC Volume (cc) Adjusted Mean volume (s.e.) 4.37 (.12) 3.64 (.12) F = 14.21 (.001)

ACC = anterior cingulate cortex, cc = cubic centimeters, L = left, LH, left handed, R = right, RH = right handed