The short-term effect size for adventure therapy was moderate (g =.47) and larger than for alternative (.14) and no treatment (.08) comparison groups. There was little change during the lead-up (.09) and follow-up periods (.03) for adventure therapy, indicating long-term maintenance of the short-term gains.
This passage establishes the foundational empirical claim of the corpus: adventure therapy produces moderate, durable short-term gains that significantly exceed both alternative and no-treatment conditions across 197 studies.
, A Meta-Analysis of Adventure Therapy Outcomes and Moderators, 2013thesis