“…To date, exploratory factor analyses of DSM-III-R/DSM-IV PTSD symptoms have been conducted with numerous populations, including survivors of fires, motor vehicle accidents and assaults, United Nations peacekeepers, refugees, and military veterans (Fawzi et al, 1997;Foa, Riggs, & Gershuny, 1995;Keane, 1993;Maes et al, 1998aMaes et al, , 1998bSack, Seeley, & Clarke, 1997;Shelby, Golden-Kreutz, & Andersen, 2005;Smith, Redd, DuHamel, Vickberg, & Ricketts, 1999;Smith, Perrin, Dyregrov, & Yule, 2003;Stewart et al, 1999;Taylor, Kuch, Koch, Crockett, & Passey, 1998). Two-, three-, four-, and five-factor solutions have been reported, with no solution clearly paralleling the symptom clusters suggested by the most recent versions of the DSM.Along with these exploratory factor analyses, numerous confirmatory factor analyses (CFAs) of DSM-III-R/DSM-IV PTSD symptoms have been conducted (Andrews, Joseph, Shevlin, & Troop, 2006;Anthony, Lonigan, & Hecht, 1999;Anthony et al, 2005;Asmundson et al, 2000;Asmundson, Wright, McCreary, & Pedlar, 2003;Baschnagel, O'Connor, Colder, & Hawk, 2005;Buckley, Blanchard, & Hickling, 1998;Cordova, Studts, Hann, Jacobsen, & Andrykowski, 2000;DuHamel et al, 2004;King, Leskin, King, & Weathers, 1998;Maes et al, 1998aMaes et al, , 1998bMarshall, 2004;McWilliams, Cox, & Asmundson, 2005;Palmieri & Fitzgerald, 2005; Palmieri, Marshall, & Schell, 2007; Palmieri, Weathers, Difede, & King, 2007;Sack et al, 1997;Simms, Watson, & Doebbeling, 2002;Stewart et al, 2004). CFAs have several advantages over exploratory factor analyses in elucidating the structure of PTSD symptoms.…”