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. Author manuscript; available in PMC: 2018 May 1.
Published in final edited form as: Int J Psychophysiol. 2016 Sep 23;115:4–12. doi: 10.1016/j.ijpsycho.2016.09.011

Table 2.

Twin correlations and estimates of additive genetic (A), shared environmental (C), and nonshared environmental (E) variance components (and 95% confidence intervals) for trait variables (DISPsyNeuro, THTPsyNeuro) and DSM-IV symptom composites.

Variable rMZ rDZ A C E
THT PsyNeuro .45 .20 .45 (.30 , .57) - .55 (.43 , .70)
DIS PsyNeuro .70 .35 .68 (.58 , .76) - .32 (.23 , .42)
DIS PsyNeuro x THT PsyNeuro .25 .02 .23 (.05, .39) - .77 (.61 , .95)
Fear Symptoms .47 .12 .45 (.29 , .58) - .55 (.42 , .71)
Distress Symptoms .39 .17 .38 (.23 , .52) - .62 (.49 , .77)
Substance Use Symptoms .56 .40 .66 (.55 , .74) - .34 (.26 , .45)

Note. rMZ and rDZ = correlations for MZ and DZ twin pairs, respectively, generated using Mx (Neale et al., 2002).THTPsyNeuro = threat sensitivity assessed using neurophysiological and self-report indicators; DISPsyNeuro = weak response inhibition assessed using neurophysiological and self-report indicators. DSM-IV symptom variables are computed as composites reflecting aggregate symptom counts for Fear, Distress, and Substance Use disorders.