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. Author manuscript; available in PMC: 2016 Dec 15.
Published in final edited form as: Psychiatry Res. 2015 Sep 1;230(2):205–210. doi: 10.1016/j.psychres.2015.08.041

Table 2.

Structural Equation Modeling Regression Analysis

Variable b(95% CI) β t p
Fearlessness
 Age −0.093(−0.386, 0.201) −0.043 −0.62 0.536
 IQ 0.013(−0.018, 0.043) 0.059 0.80 0.426
 Substance Use 0.222(0.090, 0.354) 0.235 3.29 0.001
 Brain Volume −0.003(−0.007, 0.001) −0.128 −1.67 0.091
 GMV Amygdala −0.603(−1.036, −0.169) −0.193 −2.72 0.006
 GMV Hippocampus −0.346(−0.830, 0.138) −0.103 −1.40 0.161
Disinhibition
 Age −0.174(−0.363, 0.014) −0.123 −1.82 0.069
 IQ −0.024(−0.043, −0.005) −0.175 −2.50 0.012
 Substance Use 0.163(0.079, 0.248) 0.264 3.81 <0.001
 Brain Volume −0.001(−0.003, 0.002) −0.036 −0.48 0.629
 GMV Amygdala −0.019(−0.298, 0.259) −0.010 −0.14 0.891
 GMV Hippocampus −0.436(−0.746, −0.125) −0.197 −2.75 0.006
Fearlessness with Disinhibition 1.621(1.053, 2.189) 0.446 5.59 <0.001
Amygdala with Hippocampus 0.102(0.014, 0.190) 0.164 2.26 0.024

Note. Fearlessness = regression equation with the fearlessness temperament dimension as the outcome; Disinhibition = regression equation with the disinhibition temperament dimension as the outcome; Age = chronological age in years; IQ = estimated full scale Wechsler IQ; Substance Use = regular substance use; Brain Volume = total brain volume (white + gray matter); GMV Amygdala = average gray matter volume for left and right amygdala × 100; GMV Hippocampus = average gray matter volume for left and right hippocampus ×100; Fearlessness = fearlessness temperament dimension; Disinhibition = disinhibition temperament dimension; Fearlessness with Disinhibition = correlation between the fearlessness and disinhibition temperament dimensions; Amygdala with Hippocampus = correlation between the amygdala and hippocampus average gray matter volumes; N = 191.