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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Psychol Med. 2013 Sep 4;44(7):1499–1509. doi: 10.1017/S0033291713002286

Table 1.

Cross-Twin Correlations for PTSD Symptom Count and Combat Exposure

Variable PTSD
Combat
MZ DZ MZ DZ
PTSD .29 .14
Combat .08 .03 .43 .20

Note. PTSD = posttraumatic stress disorder; MZ = monozygotic; DZ = dizygotic.