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This study reports on a meta-analytic review of 197 studies of adventure therapy participant outcomes (2,908
effect sizes, 206 unique samples). 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. The short-term adventure
therapy outcomes were significant for seven out of the eight outcome categories, with the strongest effects for
clinical and self-concept measures, and the smallest effects for spirituality/morality. The only significant moderator of
outcomes was a positive relationship with participant age. There was also evidence that adventure therapy studies have reported
larger effects over time since the 1960s. Publication bias analyses indicated that the study may slightly underestimate
true effects. Overall, the findings provide the most robust meta-analysis of the effects of adventure therapy to date.
Thus, an effect size of approximately .5 is suggested as a benchmark for adventure therapy programs, although this should
be adjusted according to the age group.