58 Chapter 3 results will inform specialized mild intellectual disability practice on the potential applicability of Take it Personal! to adolescents and young adults with different levels of emotional and behavioral problems. 2. Methods 2.1 Participants and procedure Initially 76 adolescents and young adults with a mild intellectual disability from 14 treatment centers in the Netherlands were recruited and screened for participation in this quasi-experimental study. All treatment centers were specialized in offering intra- and extramural care for people with a mild intellectual disability and complex emotional and/or behavioral problems. Adolescents and young adults could only be included if they were between 14 and 30 years old, had a total IQ between 50 and 85, and had one of the four personality risk profiles for problematic substance use. Furthermore, their use of alcohol, cannabis and/or other illicit had to be assessed by their clinician as anywhere between experimental and mild substance use disorder. To assess this, clinicians used the standardized criteria for a substance use disorder of the DSM-5 (American Psychiatric Association, 2013). A total of 66 adolescents and young adults (47 male, Mage = 17.5, MIQ = 73.7) from 11 treatment centers met these inclusion criteria and were assigned to one of the two conditions. Those in the intervention condition (n = 34) followed Take it Personal! and those in the control condition (n = 32) received care as usual. The latter was neither standardized nor protocolled. Take it Personal! required group constellations of three or four adolescents and young adults from the same treatment center and the from same personality profile (AS, NT, IMP, or SS). An independent researcher therefore assigned participants to either Take it Personal! or the control group based on a file that only listed participant identification numbers, their treatment center, and their personality profile. Information about IQ was obtained via client files that contain recent, upto-date IQ scores measured with either the Wechsler Intelligence Scale for Children (fourth or fifth edition, Wechsler, 2003; Wechsler, 2014) or the Wechsler Adult Intelligence Scale – Fourth edition (Wechsler, 2008). The trial was originally registered at the Dutch Trial Register (NTR5037; 15 April 2015) as a randomized controlled trial with 140 participants. However, individual or cluster randomization proved not possible because we were not able to include enough participants, and Take it Personal! required group constellations of three or four participants with the same personality profile within the same
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