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Table 1 Mean (SD) Hippocampal volumes in monozygotic twins with PTSD, their trauma-unexposed twins, and in trauma-exposed and trauma-unexposed monozygotic twins without PTSD

From: The relationship between Hippocampal asymmetry and working memory processing in combat-related PTSD – a monozygotic twin study

  PTSD (n = 24) Non-PTSD (n = 46)
  Trauma exposed (n = 12) Trauma unexposed (n = 12) Trauma exposed (n = 23) Trauma unexposed (n = 23)
Right HC volume (ml) 3.32 (0.59) 3.26 (0.39) 3.76 (0.54) 3.61 (0.48)
Left HC volume (ml) 3.34 (0.46) 3.49 (0.57) 3.65 (0.50) 3.63 (0.45)
Total HC volume (ml) 6.66 (0.83) 6.75 (0.90) 7.41 (0.93) 7.25 (0.69)