In one of the biggest reviews of the studies on PTSD, Ozer et al.(2003) found that psychological processes at the time of or around the trauma, not prior characteristics, are the strongest predictors of PTSD.

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Ozer et al. (2003) conducted a comprehensive review and found that factors such as the individual's psychological response during or immediately after the trauma were more predictive of PTSD than pre-existing characteristics.

In One of the Biggest Reviews of the Studies on PTSD