“…Fifteen of the 16 therapy programs (n = 7 controlled, n = 8 pre-post) evaluated improvements in mental health symptomology, while only five studies (n = 4 pre-post, n = 1 controlled) assessed psychosocial functioning (Farrell et al, 2012;Hickey et al, 2020;Hides et al, 2011;Hopkins et al, 2017;Schley et al, 2018). Eleven of the 15 studies (8/8 pre-post, 3/7 controlled) found significant improvements in young people's mental health symptoms following engagement in a therapy program, with variability in effect sizes ranging from very small (d = 0.14, Kehoe et al, 2014) to very large (d = 2.07, Hickey et al, 2020). Specific outcomes included significant reductions in general symptom severity, (d = 0.31-2.07, Hall et al, 2021;Havighurst et al, 2015;Hickey et al, 2020;Porter & Nuntavisit, 2016), depressive symptoms (d = 0.14-1.45, Hayes et al, 2011;Kehoe et al, 2014;Schley et al, 2018), anxiety (d = 0.46-0.86, Hudson et al, 2015Kehoe et al, 2014;Schley et al, 2018;Westwater et al, 2020), OCD symptoms (d = 0.92, Farrell et al, 2012 and psychological distress (d = 0.75, Schley et al, 2018;Tan & Martin, 2015).…”