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. Author manuscript; available in PMC: 2008 Nov 15.
Published in final edited form as: Biol Psychiatry. 2007 Jul 9;62(10):1088–1094. doi: 10.1016/j.biopsych.2007.04.036

Table 1.

Cross-twin tetrachoric correlations for conduct disorder, major depression and PTSD by zygosity.

MZ Twin 2 DZ Twin 2
Twin 1 Conduct disorder Major depression PTSD Conduct disorder Major depression PTSD
Conduct disorder 0.41 0.23 0.18 0.32 0.12 0.14
Major depression 0.24 0.39 0.32 0.16 0.14 0.15
PTSD 0.12 0.22 0.28 0.15 0.15 0.20

Note: Cross-twin within-phenotype correlations are in bold.