246 Appendices Table 1. List of excluded full-text studies. Study Full reference Reason for exclusion Castelein et al. (2008) Castelein, S., Bruggeman, R., Van Busschbach, J. T., Van Der Gaag, M., Stant, A. D., Knegtering, H., & Wiersma, D. (2008). The effectiveness of peer support groups in psychosis: A randomized controlled trial. Acta Psychiatrica Scandinavica, 118(1), 64-72. wrong intervention: support group intervention Chen et al. (2020) Chen, Y., Yau, E., Lam, C., Deng, H., Weng, Y., Liu, T., & Mo, X. (2020). A 6-month randomized controlled pilot study on the effects of the clubhouse model of psychosocial rehabilitation with Chinese individuals with schizophrenia. Administration and Policy in Mental Health and Mental Health Services Research, 47(1), 107-114. wrong intervention: clubhouse model with no specific focus on social network enhancement Conner et al. (2021) Conner, K. O., Gum, A. M., Schonfeld, L., Kosyluk, K., Anderson, E., Baker-Douglan, J., ... & Reynolds, C. F. (2021). Enhancing care transitions intervention with peer support to improve outcomes among older adults with co-occurring clinical depression: A pilot study. Home Health Care Services Quarterly, 40(4), 324-339. wrong intervention: peer support-delivered transitional intervention Dennis (2003) Dennis, C. L. (2003). The effect of peer support on postpartum depression: A pilot randomized controlled trial. The Canadian Journal of Psychiatry, 48(2), 115-124. wrong population: psychiatric population unclear Dennis et al. (2009) Dennis, C. L., Hodnett, E., Kenton, L., Weston, J., Zupancic, J., Stewart, D. E., & Kiss, A. (2009). Effect of peer support on prevention of postnatal depression among high risk women: Multisite randomised controlled trial. BMJ, 338, a3064. wrong population: psychiatric population unclear Ellis et al. (2011) Ellis, L. A., Campbell, A. J., Sethi, S., & O'Dea, B. M. (2011). Comparative randomized trial of an online cognitive-behavioral therapy program and an online support group for depression and anxiety. Journal of Cybertherapy and Rehabilitation, 4(4), 461-467. wrong population: psychiatric population unclear; student sample Evans et al. (1995) Evans, R. L., & Connis, R. T. (1995). Comparison of brief group therapies for depressed cancer patients receiving radiation treatment. Public Health Reports, 110(3), 306. wrong intervention: support group intervention Fan et al. (2022) Fan, Y., Ma, N., Ouyang, A., Zhang, W., He, M., Chen, Y., ... & Caine, E. D. (2022). Effectiveness of a community-based peer support service among persons suffering severe mental illness in China. PeerJ, 10, e14091. wrong intervention: peer support intervention Gjerdingen et al. (2013) Gjerdingen, D. K., McGovern, P., Pratt, R., Johnson, L., & Crow, S. (2013). Postpartum doula and peer telephone support for postpartum depression: A pilot randomized controlled trial. Journal of Primary Care & Community Health, 4(1), 36-43. wrong population: psychiatric population unclear; mothers with depressive symptoms Glynn et al. (2002) Glynn, S. M., Marder, S. R., Liberman, R. P., Blair, K., Wirshing, W. C., Wirshing, D. A., ... & Mintz, J. (2004). Supplementing clinic-based skills training with manual-based community support sessions: Effects on social adjustment of patients with schizophrenia. Focus, 159(1), 829-77. wrong study design: social skills intervention with community support sessions was compared to wrong control group
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