85 Randomized controlled trial of a social network intervention 3 Handelsman, 1997; Bernstein et al., 2003; Scher, Stein, Asmundson, McCreary, & Forde, 2001; Thombs et al., 2009). The CTQ-SF will be administered at baseline. Attachment style The Attachment Styles Questionnaire (ASQ), a 24-item 5-point Likert-type self-report questionnaire (van Oudenhoven, Hofstra, & Bakker, 2003) is used to generate individual measures of four attachment styles: secure, fearful, dismissive, and preoccupied. The construct validity of the four scales is adequate as well as the reliability, except for the dismissing style (Mosterman & Hofstra, 2014). The ASQ will be administered at baseline and 12 months after baseline. Demographic characteristics Demographic and general patient characteristics, such as treatment history, criminal history, medication use, age, gender, ethnicity, educational level, and marital status, will be collected. A self-developed questionnaire will be administered at baseline, 12 months, and 18 months after baseline. Working alliance TheWorking Alliance Inventory-short form (WAI-sf) (Horvath & Greenberg, 1989; Vervaeke & Vertommen, 1996) a 12-item 5-point Likert-type self-report questionnaire, will be assessed to measure the therapeutic alliance of patient-therapist pairs. The WAI-sf measures three domains of therapeutic alliance: (1) patient-therapist agreement on the (value of) treatment goals, (2) patient-therapist agreement about the tasks (to achieve goals), and (2) the quality of the bond between patient and therapist. Psychometric properties are found to be adequate (Horvath & Greenberg, 1989; Paap, Schrier, & Dijkstra, 2019). The questionnaire will be filled out by both patient and coach at 3, 6, 9 and 12 months after baseline. Intellectual disabilities The Screener for Intelligence and Learning Disabilities (SCIL) is administered at baseline if official, recent information (not older than 2 years) about IQ levels of the patient is not available. The SCIL is a Dutch screening instrument that is validated and often used within similar populations to detect IQ levels under 85 (Kaal, Nijman, & Moonen, 2015). The instrument consists of multiple assignments such as calculating, writing, reading, spelling, understanding of a proverb and drawing. Furthermore, the total score is also based on questions about the education level, use of intellectual disability services, reading behavior
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