The present study included Wave 2 participants, as the Wave 2 interview included all relevant variables. Of the 34,653 participants assessed at Wave 2, 46.0% (N = 15,940) had a prior psychiatric diagnosis (lifetime), and were excluded from the present analyses. This was done so that we can specifically examine the lifetime onset of psychiatric symptoms following 9/11 exposure, versus the reoccurrence of prior lifetime psychiatric symptoms. The present analyses included 18,713 participants with no history of psychiatric disorders prior to 9/11. As shown in Table 1, participants were 58% female with an age range of 21–90 (Mean = 49.1, Standard Deviation (SD) = 17.3). White participants comprised 58.2% of the sample, African Americans 19.0%, Hispanics 18.4%, Asian or Pacific Islanders 2.8% and American Indians and Alaska Natives 1.7%.
