Peer Support Intervention for Suicide Prevention Among High-Risk Adults in Michigan: A Randomized Clinical Trial.

Importance: Innovative approaches to address interpersonal risk factors for suicide attempts and suicidal ideation may help reduce persistently elevated suicide rates in the US. Objective: To determine whether Peers for Valued Living (PREVAIL), a posthospital peer support intervention, reduces suicide attempts and suicidal ideation among adults psychiatrically hospitalized for suicide risk. Design, Setting, and Participants: This single-masked, randomized clinical trial recruited adult psychiatric inpatients aged 18 years or older from 3 Michigan-based facilities between June 22, 2018, and December 30, 2022. The study compared 3 months of the PREVAIL intervention plus enhanced usual care with enhanced usual care only, with 3 months of postintervention follow-up. Intervention: One-on-one support from a peer specialist initiated during hospital admission and continued 3 months after discharge. Main Outcomes and Measures: Suicide attempts were measured using the Columbia Suicide Severity Rating Scale, and suicidal ideation was measured using the Beck Scale for Suicidal Ideation at 3 and 6 months after randomization. Results: Of 5310 patients screened, 455 were randomized using a minimization algorithm. A total of 229 participants were randomized to the PREVAIL peer mentorship arm (mean [SD] age, 32.4 [14.0] years, 134 women [58.5%]), and 226 were randomized to the enhanced usual care arm (mean [SD] age, 31.6 [13.5] years; 139 women [61.5%]). In the intention-to-treat sample with nonmissing data, the percentage of participants with any suicide attempt over 6 months (including participants who only completed 3-month follow-up assessments) was 17.2% (28 of 163) for enhanced usual care and 14.9% (24 of 161 with 2 deaths by suicide) for PREVAIL. Mean (SD) suicidal ideation scores were 4.3 (95% CI, 3.2-5.3) for enhanced usual care and 4.9 (95% CI, 3.7-6.1) for PREVAIL at 6 months. There were no statistically significant effects of the intervention for either outcome in the primary analyses. In post hoc analyses, the interaction between study arm and the COVID-19 pandemic was statistically significant. The enhanced usual care arm had a mean (SD) 6-month suicidal ideation score of 3.5 (6.1) before and 6.1 (7.4) after the pandemic vs the PREVAIL arm (mean [SD] scores, 5.0 [7.7] and 4.5 [6.6], respectively). There were 2 study-related adverse events, with 1 resulting in participant withdrawal from the intervention arm. Conclusions and Relevance: In this randomized clinical trial, the peer-delivered PREVAIL intervention up to 3 months after discharge did not significantly differ from enhanced usual care in terms of reducing subsequent suicide attempts or suicidal ideation. Trial Registration: ClinicalTrials.gov Identifier: NCT03373916.