In a cohort of European American motor vehicle collision (MVC) trauma survivors, PTSD‐PRS significantly predicted risk of posttraumatic stress (2.21%) and depressive symptoms (2.77%).[135] Moreover, individuals living in non‐disadvantaged neighborhoods and with college education had 47% and 52% less risk of developing posttraumatic stress.[135] Studies on Rwandan refugees have also identified significant interactions of exposure to genocidal trauma with two candidate genes for PTSD: SLC6A4[105] and COMT. Here, COMT is linked to post-traumatic stress disorder.