43 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) El-Bassel et al. (1995) 49 52 SNI TAU Skills-building and social support enhancement intervention: enabling the assessment of social networks, strengthen ties to drug-free support networks, gain access to formal and informal help and use supportive individuals in reducing HIV/AIDS risk behavior and solving life problems. group; clinical intervention peer supporter no 2 Gater et al. (2010) 34 32 SNI; TAU+SNI TAU (TAU +) social group intervention: addressing social difficulties, isolation, and poor access to primary care within a local community center. group; community empowerment volunteer no 2,5 Hanlon et al. (1999) 270 117 TAU+SNI TAU; TAU+ TAU + social support program: identification and use of personally relevant social support systems in the community. individual; case management professional no 12 Harris et al. (1999) 43 43 SNI passive Befriending: providing support by meeting and talking with a patient, acting as a ‘friend’. individual; volunteer linking volunteer no 12 Hengartner et al. (2016) 76 75 SNI TAU Post-discharge network coordination program: promoting recovery through social relationships; improving hospital discharge planning or the transition from inpatient to outpatient care by coordinating a social support network. individual; case management professional yes 3
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