“…Although some researchers have identified the hyperarousal cluster as particularly important in predicting the development of PTSD (O'Donnell, Elliott, Lau, & Creamer, 2007; Schell, Marshall, & Jaycox, 2004; Solomon, Horesh, & Ein-Dor, 2009), others have found reexperiencing symptoms to be more frequently endorsed (Rasmussen, Smith, & Keller, 2007) and to be associated with more severe PTSD (Conrad et al, 2004). Additional research has suggested that avoidance symptoms are endorsed most frequently (Kopel & Friedman, 1997) and are more likely to persist over time (Herkov & Biernat, 1997; Marshall et al, 2006; Perkonigg et al, 2005; Solomon et al, 2009), with some researchers noting that the numbing symptoms of that cluster are often most strongly associated with current PTSD (Foa et al, 1995; Marshall et al, 2006). At the same time, however, others have found avoidance symptoms to be associated with lower severity of PTSD (Betemps et al, 2003).…”