47 Review of social network intervention studies 2 Study Intervention (n) Control (n) Intervention group Control group Authors’ definition of intervention group Intervention type* Intervention caregiver Personal network involvement Duration (months) Simpson et al. (2014) 12 11 TAU+SNI TAU TAU + peer support workers: providing social and emotional support, encouraging social or personal change. individual; volunteer linking peer supporter no 1 Sledge et al. (2011) 38 36 TAU+SNI TAU TAU + peer mentor: providing social support. individual; volunteer linking peer supporter no 9 Stahler et al. (2007) 8 10 TAU+SNI TAU+ TAU + bridges: forming supportive and friendly relationships, focusing on social isolation, facilitating the transition into a drug-abstinent community. individual and group combined; volunteer linking volunteer no 6 Terzian et al. (2013) 173 172 TAU+SNI TAU TAU + social network intervention: encouraging social activities outside the services’ resources and with members of the community. individual; case management professional; personal network member; volunteer yes 6 van Wel et al. (2013) 25 28 TAU+SNI TAU TAU + befriending: providing a relationship with a paid friend and encouraging social and recreational activities. individual; volunteer linking paid volunteer no 18 Villemoes et al. (2018) 40 46 TAU+SNI TAU TAU + community-based family support intervention: providing a connection to ordinary society by arranging friendships outside the psychiatric system but embedded in the local community mental health center individual; volunteer linking personal network member yes 24
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