“…For nine of the papers (Bichescu, Neuner, Schauer, & Elbert, 2007;Bradley & Follingstad, 2003;Gottschalk, Covi, Uliana, & Bates, 1973;Hilkey, Wilhelm, & Horne, 1982;Maunder et al, 2009;Nguyen, 2005;Valentine & Smith, 2001;Wilson, 1990;Zlotnick, Johnson, & Najavits, 2009), the means, standard deviations, and number of individuals in the intervention and control groups necessary to calculate a Hedges g effect size were published, and therefore figures could be derived. Where an effect size was published, a re-calculation was made to ensure accuracy of figures, and if an alternative method of calculating effect sizes was given, a Hedges g calculation was undertaken providing all the summary statistics were available to do so.…”