Elien Neimeijer

45 studies in Dutch and German residential youth care (De Decker et al., 2018; Heynen et al., 2016) and secure psychiatric settings (Ros et al., 2013), we hypothesize a negative association between aggressive incidents and support, atmosphere, and growth. Also, we expect a positive association between aggressive incidents and repression. More specifi- cally, when clients experience more support, a more positive atmosphere and more pos- sibilities for growth, there would be less aggressive incidents on the living group. Also, more aggressive incidents were expected when clients report more repression. To date, no studies have been conducted to explore the relations between coercive measures, aggressive incidents and group climate for individuals with MID-BIF. Based on studies from De Valk (2015, 2016) we hypothesize a positive association between repression and use of coercive measures on the one hand and a positive association between aggressive incidents and coercive measures on the other hand. Also, we expect that the relation between group climate and coercive measures is mediated by aggressive incidents, such that in a therapeutic climate with higher levels of support, atmosphere, and growth, less aggressive incidents occur and therefore less coercive measures are expected. When cli- ents experience more repression, more aggressive incidents may occur, thus leading to more coercive measures. Due to the nested data structure (clients are nested within living groups) multilevel analysis will be used to examine whether group climate is related to the frequency of aggressive incidents in clients with MID-BIF. We also examined differences in perceived group climate between different subgroups, addressing within-group (age, IQ, gender, legal status, and treatment duration) and between-group (security level, group size, and care intensity) variables. Method Participants The sample consisted of 248 participants (76% male), aged between 18 and 93 years (M = 41.4, SD = 13.2), who were residents of Trajectum, a secure forensic treatment facility for individuals with MID-BIF located in the northern and eastern part of the Netherlands. They resided in 58 living groups; modal group size was 9 participants. Living groups varied from solely male groups (22%) to mixed groups (78%). All 441 residents were invited to participate. In total, 248 residents were willing to