Post-traumatic stress disorder (PTSD) statistics vary depending on the source, but while the majority of people experience at least one traumatic event over the course of a lifetime, only a fraction develop PTSD, between 6-8 percent.
PTSD has many risks and protective factors. The risks include younger age, female gender, being hurt or seeing someone get hurt, having higher-stress living conditions on top of the trauma, and a prior history of mental illness or substance use disorder.
Protective factors include getting support from others, positive self-appraisal in dealing with the trauma, adaptive coping strategies, having a strong system of meaning and/or faith, and biological factors. While there has been a significant amount of research on resilience and post-traumatic growth, synthesis of research is needed to confirm the highest-value targets for prevention, preparedness, and intervention. Resources are scarce, and trauma uses them up fast on every level, from individual to community.