Here in a sanguine habitancy? the P trait candidate gene didn't predict PTSD after earthquakes, but it did predict history of anxiety and emotional reactivty.
We don't have the entire article, but one interpretation would be that NP types didn't differ from N types in tendancy to develop PTSD. Since PTSD is a broad category, one would expect nothing different. But the analysis did bring out the link of this gene with anxiety disorder.
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