“…Likewise, Krupnick et al (2008) found that group interpersonal psychotherapy was significantly more effective than a wait list condition in reducing PTSD and depression symptom severity, both at end-of-treatment and at 4 months follow-up. A number of quasi-experimental and observational studies of interpersonal and dynamic/analytic group psychotherapy (Carver, Stalker, Stewart, & Abraham, 1989;Cloitre & Koenen, 2001;Longstreth, Mason, Schreiber, & Tsao-Wei, 1998;Lundqvist, Svedin, Hansson, & Broman, 2006;Sharpe, Selley, Low, & Hall, 2001) all indicate beneficial post-treatment and longer-term (up to 2 years) outcomes although the effect sizes vary widely between studies and measures. Another approach with a very limited evidence-base as a treatment for sexual abuse is systemic therapy (i.e.…”