184 Chapter 7 RCT was to examine whether TAU plus FNC would increase mental wellbeing in forensic psychiatric outpatients compared to TAU alone. Second, we aimed to examine whether psychiatric functioning, criminal recidivism, and other secondary treatment outcomes would improve in patients receiving TAU plus FNC compared to patients receiving TAU. Third, we aimed to explore potential moderators of treatment effects. In addition, we described that qualitative methods were used alongside the RCT to explore experiences of patients receiving the additive intervention and their volunteer coaches. In chapter 4 we described the qualitative results of the RCT regarding the experiences of patients and volunteer coaches with the additive informal social network intervention (FNC) as well as their perceived barriers and facilitators affecting the engagement in FNC. Reflexive thematic analyses of 22 interviews with patients and 17 interviews with volunteer coaches resulted in the identification of five main themes, reflecting both patients’ and coaches’ experiences: dealing with patient receptivity, developing social bonds, receiving social support, achieving meaningful change, and using a personalized approach. The results showed positive experiences related to the development of a bond between patients and coaches, as well as barriers related to patients’ receptivity, complicating their engagement in the additive intervention. For example, patients and coaches were able to develop a supportive relationship in which they experienced positive social interactions and engaged in social activities. However, patients’ willingness, attitudes, and timing issues due to various problems and responsibilities affected their engagement. Moreover, regardless of the development of a bond between patients and coaches, patients showed an unwillingness and inability to focus on other social network-related goals outside the relationship with the coach. Patients’ social lives did not clearly improve through the additive FNC intervention. Overall, the results suggest that the development of a supportive bond between patients and coaches in the community was a meaningful achievement that could initiate further personal growth in forensic outpatients. For implementation, we suggested tailoring the additive informal social network intervention to patients’ specific needs, considering their willingness and attitudes, as well as timing. In chapter 5 we reported the quantitative results of the RCT. We examined the effectiveness of the additive informal network intervention (FNC) in addition to TAU compared to TAU alone on mental wellbeing (primary outcome), general psychiatric functioning, hospitalization, criminal behavior, and incarceration (key secondary outcomes), and other secondary treatment outcomes. Additionally, treatment effects of patients with different compliance levels (i.e., no, low, and high compliance to FNC) on primary and key secondary outcomes were examined. Finally, potential moderators of treatment effects were
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