article_snippet: Women are about twice as likely as men to develop the disorder.
article_snippet: Symptoms tend to cluster into three areas: .
article_snippet: Studies of twins show heredity accounts for about 30% of the differences in response to trauma, with identical twins much more likely to both develop PTSD than fraternal twins.
article_snippet: Other research has looked into the role of inherited brain differences, mental disorders, or addictive tendencies.
article_snippet: In this vein, we are able to start labeling findings as being putatively 'causal' in nature.
article_snippet: Baker stresses these questions are purely hypothetical at this time and that the study needs to be replicated and expanded.
article_snippet: We're early in the process of having some clues as to what might predict risk and resilience, and with more research We'll begin to have effective preventions and treatments," says Baker.
highlights_snippet: Genes account for about 30% of risk .
  