Final answer:
The tendency to develop PTSD is most closely related to having a history of repeated trauma, not to gender, genotype for the serotonin transporter, exposure to mild stressors, or a history of bipolar disorder.
Step-by-step explanation:
The tendency to develop post-traumatic stress disorder (PTSD) is most closely related to having a history of repeated trauma. PTSD is an anxiety disorder that occurs after a person experiences severe psychological trauma, which can include events like military combat, physical assaults, or natural disasters.
Research has found that specific factors, such as predeployment personality traits, exposure to trauma, and even certain genetic predispositions, can influence the likelihood of developing PTSD.
Moreover, the tendency to develop PTSD is not specifically related to gender, though some studies indicate different patterns of exposure and reactions to trauma among men and women. Stressful life events and one's genotype for the serotonin transporter can interact to affect PTSD prognosis. Factors such as a history of bipolar disorder or exposure to mild stressors have not been shown to be as strongly predictive of PTSD as a history of repeated, severe trauma.