In a recent study done after the 2011 Christchurch, NZ earthquake an odd result turned up. Researchers are not quite sure how to account for the difference. But it bears watching in future earthquake events. See Women Wounder More than Men, provided here.
Thanks to Ian McLean of NZ for providing me with this citation.
Recovery Diva 
– Also see significant research findings of Dr. David Laplante and colleagues at McGill – URL Mcgill.ca/spiral (Stress in Pregnancy Research Alliance).
Don Watson