Daan Hulsmans

60 Chapter 3 Figure 1 Flow diagram of enrolment and retention by treatment arm Note. ITT = Intention to treat. 2.2.2 Emotional and behavioral problem domains Adolescents and young adults’ emotional and behavioral problems were measured with a Dutch version of the Youth Self Report (YSR; Achenbach, 1991; Verhulst et al., 1997). This questionnaire can reliably be administered to adolescents and young adults with a mild intellectual disability (Douma et al., 2006). The YSR includes 118 items that can be rated on a 3-point Likert scale with (0) ‘not true at all’, (1) ‘somewhat or sometimes true’, or (2) ‘very true or often true’, and has three overall subscales: internalizing problems, externalizing problems, and other problems. Anxious (13 items; e.g. ‘I feel fearful’) and withdrawn (8 items, e.g. ‘I would rather be alone than around others’) problems fall within the internalizing subscale, while rule-breaking (15 items, e.g. ‘I am truant’) and aggressive (17 items, e.g. ‘I get in fights’) problems make up the externalizing category. All four problem domains show acceptable to good internal consistency with Cronbach’s α = 0.64 for anxious, 0.82 for withdrawn, 0.69 for rule-breaking, and 0.77 for aggressive problems.

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