title: A Meta-Analysis of Hypnotherapeutic Techniques in the Treatment of PTSD Symptoms.
abstract: The efficacy of hypnotherapeutic techniques as treatment for symptoms of posttraumatic stress disorder (PTSD) was explored through meta-analytic methods. Studies were selected through a search of 29 databases. Altogether, 81 studies discussing hypnotherapy and PTSD were reviewed for inclusion criteria. The outcomes of 6 studies representing 391 participants were analyzed using meta-analysis. Evaluation of effect sizes related to avoidance and intrusion, in addition to overall PTSD symptoms after hypnotherapy treatment, revealed that all studies showed that hypnotherapy had a positive effect on PTSD symptoms. The overall Cohen's d was large (-1.18) and statistically significant (p < .001). Effect sizes varied based on study quality; however, they were large and statistically significant. Using the classic fail-safe N to assess for publication bias, it was determined it would take 290 nonsignificant studies to nullify these findings.
authors: California School of Professional Psychology at Alliant International University, Fresno Campus, Fresno, California, USA.
authors: Siobhan K
authors: SK
authors: O'Toole
authors: California School of Professional Psychology at Alliant International University, Fresno Campus, Fresno, California, USA.
authors: Shelby L
authors: SL
authors: Solomon
authors: California School of Professional Psychology at Alliant International University, Fresno Campus, Fresno, California, USA.
authors: Stephen A
authors: SA
authors: Bergdahl
mesh_terms: D006801:Humans; D006990:Hypnosis / Q000379:methods*; D012720:Severity of Illness Index; D040921:Stress Disorders, Traumatic / Q000628:therapy*; D016896:Treatment Outcome