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Studying moderators and mediators of intervention effects is essential to elucidate for whom and why TGF works. Using a randomised controlled trial design, we examined youth's baseline mindset, gender, age, level of ID and intervention satisfaction as moderators of TGF effects and examined whether the intervention effects of TGF on improvements in mental health were mediated by perseverance.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The sample consisted of 119 participants with mild to borderline ID (<jats:italic>M<\/jats:italic><jats:sub><jats:italic>age<\/jats:italic><\/jats:sub>\u00a0=\u00a015.83;<jats:italic>SD<\/jats:italic>\u00a0=\u00a02.23), randomly assigned to the intervention (<jats:italic>n<\/jats:italic>\u00a0=\u00a060) or passive control group (<jats:italic>n<\/jats:italic>\u00a0=\u00a059). Participants reported mindsets, perseverance, internalising, externalising, attention and total mental health problems at pre\u2010test, at post\u2010test and at 3\u2010month follow\u2010up. Additionally, youth in the intervention group graded their satisfaction with a score at the end of each session.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Findings indicated that the effectiveness of TGF was not affected by participants' baseline mindsets, age and ID level. TGF was more effective in reducing internalising problems in girls and increasing perseverance in boys. In addition, in the intervention group TGF was more effective in improving internalising, externalising and total mental health problems for youth who reported higher levels of intervention satisfaction at post\u2010test. Finally, TGF indirectly decreased internalising and externalising problems at follow\u2010up through improvements in perseverance reported at post\u2010test.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>TGF offers a universal, \u2018add\u2010on\u2019 mindset intervention complementing usual care programmes. It improves mindsets, perseverance and mental health in youth with ID. Both practical and theoretical implications are discussed.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jir.12970","type":"journal-article","created":{"date-parts":[[2022,9,1]],"date-time":"2022-09-01T10:44:47Z","timestamp":1662029087000},"page":"817-832","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["The online mindset intervention \u2018The Growth Factory\u2019 for adolescents with intellectual disabilities: moderators and mediators"],"prefix":"10.1111","volume":"66","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6809-2982","authenticated-orcid":false,"given":"F.","family":"Verberg","sequence":"first","affiliation":[{"name":"Pluryn Research &amp; Development Nijmegen The Netherlands"},{"name":"Research Institute of Child Development and Education University of Amsterdam Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P.","family":"Helmond","sequence":"additional","affiliation":[{"name":"Pluryn Research &amp; Development Nijmegen The Netherlands"},{"name":"Research Institute of Child Development and Education University of Amsterdam Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R.","family":"Otten","sequence":"additional","affiliation":[{"name":"Behavioural Science Institute Radboud University Nijmegen The Netherlands"},{"name":"REACH Institute, Department of Psychology Arizona State University Tempe AZ USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G.","family":"Overbeek","sequence":"additional","affiliation":[{"name":"Research Institute of Child Development and Education University of Amsterdam Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,9]]},"reference":[{"key":"e_1_2_11_2_1","unstructured":"AchenbachT. 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