User-Reported Mechanisms of Change on a Suicide Prevention Website: Single-Arm Pragmatic Trial.

Background: Digital platforms can serve as effective interventions for individuals in crisis, those with limited access to mental health resources, or those who prefer web-based support over in-person care. NowMattersNow.org, a web-based platform grounded in dialectical behavior therapy, has been shown to reduce suicidal thoughts and negative emotions. However, little is known about the specific mechanisms that drive these improvements. Identifying the active ingredients that contribute to its effectiveness will help optimize its impact.

Objective: This study examined the reasons users reported behind reductions in suicidal thoughts and negative emotions after visiting NowMattersNow.org. Specifically, this study sought to determine which reported reasons were associated with greater versus lesser improvements and whether these changes differed across specific subgroups.

Methods: In this single-arm pragmatic trial, data were collected from 3185 respondents who completed a 6-item retrospective survey while visiting NowMattersNow.org. The survey assessed changes in suicidal ideation and emotional distress (ie, intensity upon entering the site vs at the time of survey completion), reasons the website was helpful, and basic nonexclusive demographic information. Cross-tabulations were used to examine the most commonly endorsed reasons for finding the website helpful, while longitudinal regression analyses assessed the statistical significance of changes in suicidal ideation and emotional distress.

Results: The majority of participants reported experiencing suicidal thoughts (n=2309, 72.5%) and negative emotions (n=2745, 86.2%) upon arriving at the website, with 52.4% (n=1211) and 55.6% (n=1527) of these individuals, respectively, experiencing reductions in suicidal thoughts and negative emotions after engaging with the site. Regarding the primary aims of the study, the most frequently cited reason for finding NowMattersNow.org helpful was "I learned something" (n=668, 21%), followed by "It distracted me" (n=544, 17.1%) and "I felt less alone" (n=414, 13%). These were also the top 3 reasons reported by LGBTQI individuals, those endorsing alcohol or opioid problems, and those experiencing unusual experiences, though the order varied across groups. Among participants who experienced the largest reduction in suicidal ideation (a 4-point decrease), the most common reasons cited were "It distracted me" (n=5, 29.4%), "I felt less alone" (n=3, 17.6%), and "I felt cared for" (n=3, 17.6%). Similarly, for those with the largest reduction in negative emotions (a 4-point decrease), the most frequently endorsed reasons were "It distracted me" (n=3, 23.1%), "I felt less alone" (n=3, 23.1%), and "I felt cared for" (n=2, 15.4%).

Conclusions: The findings suggest that NowMattersNow.org is an accessible, scalable digital intervention that shows promise for reducing suicidal ideation and emotional distress, particularly in vulnerable populations. Key elements, such as fostering social connectedness, distraction, and educational content, appear to be critical components of its effectiveness, indicating that web-based self-help tools like NowMattersNow.org can provide short-term management of suicidal thoughts and negative emotions.