23 General introduction 1 on mental wellbeing and other relevant treatment outcomes compared to treatment as usual alone in forensic psychiatric outpatients. Chapter 4 presents patients’ and volunteer coaches’ experiences with the additive informal social network intervention. Qualitative methods were used to analyze experiences and perceived barriers and facilitating factors that influenced compliance of patients and volunteer coaches who participated in the randomized controlled trial. Chapter 5 presents the quantitative findings of the randomized controlled trial – the effectiveness of the additive informal social network interventions on mental wellbeing and other treatment outcomes in forensic psychiatric outpatients. In addition, the effects among patients with different levels of compliance were explored, as well as potential moderating patient characteristics. Chapter 6 focuses on the impact of the COVID-19 restrictions on social relationships of forensic psychiatric outpatients participating in the randomized controlled trial. We hypothesized that social relationships would further deteriorate due to the COVID-19 restrictions. In addition, we hypothesized that loneliness and low levels of social support would predict deterioration in social relationships due to COVID-19 restrictions. Finally, in Chapter 7 the main findings of the studies in this dissertation are summarized and discussed. Implications for future research and clinical practice are considered.
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