The purpose of this study was to examine and compare individuals that had survived a single incidence trauma, the Luby's massacre in Killeen, Texas. Participants answered questions regarding various facets of social support following the trauma, and were also screened for a diagnosis of PTSD. Participants' level of symptoms, specifically depression, anxiety, and phobic anxiety was measured over time with the SCL-90-R. The results of this study indicate that, while women initially experience a higher level of depression and phobic anxiety, there is no gender difference in rate of symptom change over time. This study also found that women were significantly higher than men on desirability, utilization and usefulness of social support. Of the target symptoms, however, only depression correlated with any facet of social support, specifically, desirability. Finally, this study questioned whether individuals would share more similarities with others based on gender or diagnosis. It is suggested by the current data that diagnosis is the better indicator of similarity.

The role of exposure to a human-made disaster and the subsequent development of post-traumatic stress reactions were examined. Subjects included 49 males and 30 females who were variously exposed to the Luby's shooting incident in Killeen, Texas in October of 1991. Post-traumatic stress symptomatology was measured by the SCL-90R. Exposure was operationalized by using a scenario-rating scheme with independent raters estimating each subject's level of exposure. A regression and commonality analysis revealed that exposure is an important predictor in post-traumatic symptomatology. Premorbid functioning and gender were also found to play important roles, with females expressing higher levels of symptomatology.