135 Effectiveness of a social network intervention 5 Study sample The flow diagram including a complete overview of the selection and assessment of participants in this trial is presented in Figure 1. A total of 184 potential participants were approached for eligibility after pre-screening, of which 106 participants were screened by research assistants to determine eligibility at baseline assessment. Subsequently, four participants were excluded before randomization, and one patient after randomization, because they were unable to respond (n = 3) or withdrew consent (n = 1). A remaining sample of 102 participants randomly assigned to TAU+FNC (n = 51) or TAU (n = 51) were included in the intention-to-treat sample. Notably, the amount of dropout in the FNC intervention intention-to-treat sample was higher than expected. A substantial group of participants failed to start with the FNC intervention (37%; n = 19) and in another group of participants (31%; n = 16) the intervention was prematurely terminated, as shown the forensic network coaching trial diagram in Figure 2. Additional per-protocol samples were defined based on the a priori set minimal 10-month duration of the FNC intervention between baseline and 12-month follow-up. However, it was not always feasible to match participants to coaches within two months after baseline. Moreover, some patient-coach dyads continued the contact after the 12-month follow-up. Therefore, different per-protocol groups were defined based on the duration of the patient-coach contact from baseline to 18-month follow-up: (1) participants matched at least 10 months were included in the high compliance group (n = 16), (2) participants matched less than 10 months were included in the low compliance group (n = 16), and (3) participants who could or did not want to be matched to a coach were included in the no compliance group (n = 19).
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