**6.1 Demographic data**

Some researchers who have examined gender differences suggest that females are more likely than males to develop PSTD (Chou et al., 2005; Helzer, Robins, & McEvoy, 1987; Johnson & Thompson, 2008; Lazaratou et al., 2008). A possible explanation for this is the specific reactions that result from feminine characteristics to a traumatic event (Chou, Tsai, Wu, Su, & Chou, 2006). Additionally, there are previous studies that have associated old age with an increased risk of developing PTSD (Goenjian et al., 1994; Lewin, Carr, Webster, 1998). However, a recent study has suggested contradictory results (Lazaratou et al., 2008).
