Demographic characteristics of the sample are shown in Table 1 by 9/11 exposure level. The majority (77.5%) of respondents reported exposure to 9/11. Most (72.8%) reported exposure indirectly: through media outlets (i.e. television, news), 3.6% had a close friend or relative injured or killed, while 0.5% (n = 170) directly experienced 9/11. Among participants who experienced 9/11 directly, males were overrepresented, whereas females were over-represented among those who experienced 9/11 indirectly. Overall, age did not vary significantly by 9/11 exposure. However participants over age 65 were less likely to have experienced 9/11 directly. Conversely, race/ethnicity did vary significantly by 9/11 exposure, with White participants being more likely to report experiencing 9/11 directly. Further details on these 9/11 exposure groups, including tests assessing differences among key descriptive variables are provided in Henriksen et al., 2010.
