I think PTSD symptoms are across the different groups, so they're consistent. The hallmark symptoms of PTSD are reliving the trauma and nightmares of the trauma. That's the core difference between PTSD and depression and anxiety, that the person has repeated nightmares.
Among public safety officers, there is more recognition in our diagnostic categories that people who are repeatedly exposed to trauma as part of their workforce are more likely to develop PTSD. That's more of a recent change in the DSM criteria, the diagnostic manual.
The main risk factors for PTSD can be high levels of childhood trauma exposure, being female, not having social supports, difficulties with poverty. Physical injury is a major risk factor, so traumatic brain injury is also a very important factor. There's more evidence recently that people who are in intensive care units, who are severely ill, are at risk for PTSD and depression as well.
The key protective factors are social supports, higher levels of education, and stronger networks in the community.