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Effects of suicide prevention videos developed by and targeting adolescents: a randomized controlled trial

Suicide prevention videos featuring young people’s personal narratives of hope and recovery are increasingly used in suicide prevention, but research on their effects is scarce. A double-blind randomized controlled trial was conducted to test the effects of a suicide prevention video featuring an adolescent mastering his suicidal ideation by getting help on 14 to 19-year-olds. N = 299 adolescents were randomly allocated to watch the intervention video (n = 148) or a control video unrelated to mental health (n = 151). Questionnaire data were collected before (T1) and immediately after exposure (T2), and 4 weeks later (T3). Data were analyzed with a repeated-measures ANCOVA. The primary outcome was suicidal ideation, assessed with the Reasons for Living Inventory for Adolescents. Secondary outcomes were help-seeking intentions, attitudes towards suicide, stigmatization of suicidality, and mood. There was an immediate beneficial effect of the intervention on suicidal ideation (T2 mean change from baseline within intervention group MChange = − 0.16 [95% CI − 0.20 to − 0.12], mean difference compared to control group MDiff = − 0.09 [95% CI − 0.15 to − 0.03], ηp2 = 0.03), which was not maintained at T3. Participants reported significantly higher help-seeking intentions, which was maintained at 4-week follow-up. They also reported a sustained reduction of favorable attitudes to suicide. Effects on suicidal ideation were mediated by identification with the featured protagonist. Adolescents appear to benefit from suicide prevention narratives featuring personal stories from peers on coping with suicidal ideation and help-seeking. Trial registration DRKS00017405; 24/09/19; retrospectively registered.


Introduction
Youth suicide is a major public health problem in many countries [1] and ranks consistently among the three most common causes of death among young people [2]. Consequently, considerable attention has been given to how youth suicide might best be combatted. One promising intervention path is media interventions [3]. In recent years, videos featuring personal stories of hope and recovery from suicidal crises have increasingly been used for prevention and education purposes. Several studies suggest that media stories featuring positive narratives of coping might reduce suicidal ideation [4,5] and increase help-seeking intentions [6], the so-called Papageno effect [7]. However, little is known about the impact of these narratives for young people [8,9]. There are currently only three randomized controlled trials (RCTs) available that investigated media effects of this kind of messaging in young adults [8,10,11], but results are inconsistent, and none of these studies have included young adolescents under the age of 18. This is in spite of the fact that this age group is confronted with youthspecific challenges, such as managing identity formation, peer pressure, and developmental changes [12,13], and the need for tailored prevention strategies has been highlighted in the literature [12,14]. Media stories explicitly targeting a young audience and providing opportunities for identification might resonate better with this group than other approaches [15]. Video campaigns might be a particularly powerful prevention approach for this age group, as young people commonly use video platforms, such as YouTube, as sources for information [16].
In the present study, we aimed to investigate short-and medium-term effects of a suicide prevention video developed by adolescents for other adolescents who experience suicidal ideation regarding several mental health-related outcomes, including suicidal ideation (primary outcomes), help-seeking intentions, attitudes to suicide, and suicide stigma (secondary outcomes). We hypothesized that the intervention video would have a beneficial impact on these outcomes. Further, in accordance with previous studies, we hypothesized that the effect on suicidal ideation would be stronger the more youth identified with the story [17,18], and the more vulnerable they were to suicide [4,11,18]. We also explored gender differences.

Participants
We conducted a double-blind RCT. Participants were recruited from July 2019 (01/07/19) to October 2020 (12/10/20). Youth aged 14-19 years were invited to participate in a study on health-related awareness videos; more specific details on the aim of the study were not provided and there was no mention of suicide. Invitation flyers were provided at locations in Vienna, Austria, including schools, university events, and online. The announcement stated that participants were required to come to the study center twice, with a 4-week time span between visits, with a compensation of 10€ per visit. Due to the COVID-19 lockdown in spring 2020, participation via an online questionnaire was additionally established to allow those who were already enrolled to complete their 4-week follow-up online.
At the beginning of the trial, inclusion criteria (i.e., age 14-19 years, good German skills, and Austrian residency/ permanently living in Austria) were checked, and included individuals completed the Beck Hopelessness Scale [19,20] to determine individual vulnerability to suicide. Hopelessness has been found to be a robust predictor of suicide risk [21,22]. For participants who scored above the cut-off score of 33, the researcher further assessed their well-being and immediate suicide risk and informed them about available help services. No participant was excluded in this process. Individual written informed consent was sought from youth and, for minors (under 18-year-olds), additionally from parents.

Randomization and blinding
Participants were provided with access to a computer workstation. Participants completed the questionnaire on a computer in the online tool SoSci Survey (www. sosci survey. de). Participants were randomly allocated to view the intervention or control video. They were randomized individually using an automated algorithm in the online tool SoSci Survey. The algorithm applied urn randomization, i.e., a simple 1:1 randomization based on a computerized algorithm (https:// www. sosci survey. de/ help/ doku. php/ en: create: ran-dom_ urns) [23].

Intervention and control video
We tested a suicide prevention video that was produced by students within a school project in 2018/2019, supervised by the lead researcher [24]. In this project, 18 high school students aged 15-19 years produced suicide prevention videos in teams. In total, seven short films were produced. All videos featured young people engaging in various sorts of help-seeking. An international jury of suicide prevention experts selected the best video based on predefined quality criteria, and this video was the intervention video. For further details see Braun et al. [24], https:// econt ent. hogre fe. com/ doi/ suppl/ 10. 1027/ 0227-5910/ a0006 96/ suppl_ file/ 0227-5910_ a0006 96_ esm2. mp4.
The video had a duration of 4.51 min and featured a 17-year-old boy telling his personal story about his past suicidal crisis and his way of mastering it. The protagonist describes the circumstances that contributed to his suicidal crisis, putting emphasis on how he came through it, noting the relevance of proactive help-seeking, and highlighting different sources of help (i.e., teacher, friends, and professional help). At the end of the video, a list of mental health services for youth was presented.
The control video had a duration of 3.54 min and focused on a personal narrative about a topic unrelated to mental health. It featured the same protagonist talking about nutrition, how he stays fit, and maintains a healthy lifestyle. At the end of the video, a list of references about nutrition and healthy lifestyle was presented. The intervention and the control video were similar in terms of style and production (see Braun et al. [24] for details).

Procedure
Before watching the video (T 1 ), socio-demographics, suicidal ideation, and all secondary outcomes (i.e., help-seeking intentions, attitudes towards suicide, stigma of suicide, and mood) were measured. Immediately after video exposure (T 2 ), all outcomes were measured again and individuals' identification with the protagonist was assessed. All participants received a link to their video via e-mail, were encouraged to rewatch the video, and got an e-mail reminder every week. The number of individual viewings was automatically recorded in a database. At 4-week follow-up (T 3 ), all outcome measures were assessed again, including an item to assess blinding success.

Suicidal ideation
Suicidal ideation was assessed with the Reasons for Living Inventory for Adolescents (RFL-A [25]). It consists of 32 self-report items (e.g., "I am afraid of killing myself") evaluating a range of adaptive beliefs and reasons for living. A rating scale from 1 (not at all important) to 6 (extremely important) was used. The RFL-A has been identified as a valid and reliable measure of adolescent suicide risk potential [26], and several versions of the RFL have been used in similar media-related studies [4,10,18]. Scores were reverse-coded, with higher scores indicating higher suicidal ideation (Cronbach's α = 0.93).

Help-seeking intentions
The 10-item General Help-seeking Questionnaire (GHSQ [27]) asks respondents to indicate the likelihood of seeking help in the case of suicidal thoughts from a variety of sources. Items were rated on a Likert scale from 1 (extremely unlikely) to 7 (extremely likely) (overall sum core: Cronbach's α = 0.67) and included subscales for private (4 items, Cronbach's α = 0.71) and professional help-seeking intentions (3 items, Cronbach's α = 0.70). Higher scores indicate greater help-seeking intentions.

Attitudes towards suicide
Attitudes towards suicide were measured with the Cognitions Concerning Suicide Scale (CCSS [28,29]). Respondents rated their level of agreement with 20 statements (e.g., "Everyone has the right to commit suicide") on a Likert scale from 1 (disagree) to 6 (agree). Higher scores indicate more favorable attitudes toward suicide (Cronbach's α = 0.83).

Stigma of suicide
The 12-item short version of the Stigma of Suicide Scale (SOSS [30]) was used to assess stigma. Items were rated on a Likert scale from 1 (strongly disagree) to 5 (strongly agree). Scores for the two subscales "Stigma" (8 items, Cronbach's α = 0.87) and "Glorification/Normalization" (4 items, Cronbach's α = 0.73) were calculated. Higher scores indicate greater stigmatizing attitudes toward suicidal individuals.

Mood
Current mood was assessed using the"Mood" subscale of the Affective State Scale (ASS [31]), which uses responses to eight adjectives describing respondents' mood, such as "merry" or "sad", scored on a scale from 1 (not at all) to 4 (highly). Higher scores indicate better mood (Cronbach's α = 0.87).

Vulnerability
The Beck Hopelessness Scale by Beck and Steer [19], a 10-item measure to assess hopelessness (e.g., "My future seems dark to me"), was used to assess vulnerability at T 1 . Based on Krampen [20], a scale rating items from 1 (very false) to 6 (very true) was used. In accordance with previous studies [11], this variable was used to assess vulnerability to suicide. For this purpose, the sample was stratified into low vs. higher vulnerability based on the sample mean (Cronbach's α = 0.77).

Identification
Identification was assessed with Cohen's Identification Scale [32]. Respondents rated their level of agreement with 10 statements (e.g., "While watching the video I could feel the emotions of character X") on a scale from 1 (completely disagree) to 5 (completely agree). Higher scores indicate greater identification with the protagonist featured in the video (Cronbach's α = 79).

Blinding success
To assess blinding success, respondents were asked at T 3 to indicate what group they thought they had been allocated to ("intervention group", "control group", or "don't know") [4,33].

Power analysis
The required sample size was calculated for a repeatedmeasures analysis of covariance (ANCOVA) with three measurements, a power of 0.80, a two-sided significance level of p < 0.05. We had 8 (2 × 2 × 2) statistical groups (i.e., two study groups: intervention versus control; two groups for identification with the protagonist: low [i.e., below the sample mean] versus high [i.e., above the sample mean]; and two groups for suicide baseline vulnerability: low [i.e., below the sample mean] versus high [i.e., above the sample mean]). Assuming a correlation of 0.79 between measuring points, 288 participants were required to detect a moderate intervention effect on suicidal ideation (Cohen's f = 0.21) [5,11,18].

Data analysis
Mean scores were calculated for each outcome variable. Differences in the primary outcome (i.e., suicidal ideation) and in the secondary outcomes between intervention and control group were calculated using a repeated-measures analysis of covariance (ANCOVA). The models were controlled for age, gender, and for baseline scores. Bonferroni-adjusted contrast tests were used to compare individual group differences.
Differences in males and females were explored by adding gender as between-subjects independent variable to the model. To examine the effects of individuals' vulnerability and identification, the dichotomized variables for suicide baseline vulnerability and identification were added as between-subjects independent variables to the model. Further, a mediation analysis using PROCESS [34] was conducted to assess whether identification with the protagonist mediated the effect of the intervention. Model 4 and a bootstrapping method with 5000 bootstrap resamples was used. The bootstrapping method produced 95% bias-corrected confidence intervals of these effects [34].

Sensitivity analysis
To check whether the findings were different in minors (i.e., participants under the age of 18), a sensitivity analysis was conducted by reanalyzing the data in this subset of participants. Patterns in 14-to 17-year-olds were similar to the presented findings in the full sample (results available on request).

Ethics statement
All procedures contributing to this work comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008. All procedures involving human participants were approved by the research ethics board at the Medical University of Vienna (study protocol 1033/2015). Individual written consent was sought from all participants and for minors additionally from parents. Trial registration: German Clinical Trial Registry (DRKS00017405; 24 September 2019; retrospectively registered).

Study participant characteristics
In total, 299 individuals were randomized (intervention group: n = 148 and control group: n = 151). N = 9 individuals did not provide data at 4-week follow-up, resulting in 290 individuals who completed the questionnaire (96.99%) and were analyzed (see study flowchart: Fig. 1). Out of the 299 participants, n = 225 participants were female (75.25%) and n = 202 participants (67.56%) had Austrian nationality. The mean age was 17.95 years (SD = 1.19), ranging from 14 up to 19 years, with n = 82 (27.42%) individuals being under 18 years old (see Table 1). N = 53 (17.73%) participants scored above the cut-off score at the baseline (T 1 ) screening for vulnerability to suicide. N = 39 (13.45%) individuals completed their participation at T 3 online. N = 46 (15.38%) participants watched the video more than once. Baseline characteristics of participants were similar between groups as indicated by χ 2 and independent t tests ( Table 1). Participants in the intervention group reported more favorable attitudes toward suicide at baseline, identified more with the portrayed character, and were more successful in guessing their group allocation correctly.
Blinding 86 participants (29.66%) guessed their group allocation correctly, 87 (30.00%) were incorrect, and 117 (40.34%), responded with "don't know". More than half of the participants in each group were either uncertain or incorrect about their group assignment, with the majority of participants responding with "don't know" in both, intervention and control group respectively. There were no differences between the two study arms in correctly guessing the group allocation (χ 2 (1) = 3.81, p > 0.05). Table 2

Effects of vulnerability
The analysis revealed no significant group × vulnerability interaction with regard to suicidal ideation.

Effects of gender
We found no effect of gender with regard to suicidal ideation. The analysis revealed a significant group × gender interaction for intentions to help-seeking in general, F(1,293) = 5.21, p < 0.05 (see Table 3). Girls/women in the intervention group had higher help-seeking intentions (T 2 M Change = 0.26 [95% CI 0.15−0.36], M Diff = 0.27 [95% CI 0.15−0.39 ]). A similar pattern was present for help-seeking intentions from private sources (F(1,293) = 9.43, p < 0.01), but not for helpseeking intentions from professional sources, which did not show any gender differences.

Discussion
This study is the first to assess the effects of a short suicide prevention video developed by and targeting adolescents in a randomized controlled trial. Young people benefitted from the brief intervention that included watching a short film featuring an adolescent with past suicidal ideation, describing his story of getting help and recovering. Adolescents reported significantly lower suicidal ideation after watching the intervention video. The video was also effective in increasing help-seeking intentions, which has been highlighted as an essential target domain for suicide prevention [3]. We found that the video increased help-seeking intentions, including from private and professional sources, and the effects were maintained until 4-week follow-up. Immediate effects on help-seeking intentions were present in girls/ women but not in boys/men, which is consistent with previous studies, suggesting that males show lower help-seeking [6,35]. There were, however, no gender differences for the crucial aspect of help-seeking from professional sources, indicating that also boys/men benefitted to some extent in terms of help-seeking intentions. Furthermore, favorable attitudes towards suicide that have previously been associated with higher suicide risk [29], decreased significantly after watching the suicide prevention video.
The findings build on and extend findings from previous studies which suggest a reduction of suicidal ideation after exposure to media stories featuring individuals telling their stories of mastering their crises [4,5,11,18]. In this study, individuals with varying levels of vulnerability to suicide benefitted from the prevention videos. Compared to previous research in the area, we identified a more than seven times higher proportion of individuals with vulnerability to suicide (N = 53; 17.73%) using the same measure and cut-off score for vulnerability [11]. This is important because some previous studies in the field have found positive effects on suicidal ideation particularly in individuals with some degree of vulnerability to suicide [4,10,11,18]. Although this is encouraging regarding positive effects in young people who are at risk, a current limitation of the available research including the present study is that it focused on individuals from the general population and all studies, except the present one, included adults [4,10,11,18]. This means that the findings cannot be generalized to young individuals with clinical suicidality. Future studies should aim to assess effects of stories of coping and recovery in young people with some degree of vulnerability based on clinical assessment. Effects in these groups might deviate from the present findings, and specific circumstances and diagnoses might be relevant to any effects.
Unlike previous studies that focused on harmful media impacts of stories of suicide [18], the reduction in suicidal Table 3 Changes in outcomes with a significant group × gender interaction in the intervention group (suicide prevention video) and control group (control video) from baseline to after video exposure (T 2 ) among boys/men and girls/women *p < 0.05. **p < 0.01. ***p < 0.001 (two-tailed).  ideation following exposure to the suicide prevention video was mediated by identification. In general, identification with the narrative was high in the intervention group and higher compared to a previous study using the same measure for identification [15]-this might be because the videos were specifically tailored to adolescents and featured a young protagonist. The findings highlight the necessity of producing narratives that the audience can easily identify with to reduce suicidal ideation.
Although there are studies on personal media narratives of hope, which have found a media effect on either suicidal ideation [4,5] or help-seeking [6], this is the first study that detected preventive effects on both of these crucial outcomes. This finding indicates that it is indeed possible to positively influence both outcomes with the same narrative. The present narrative emphasized both, the individual mastery of the suicidal crisis and the proactive help-seeking and success of help-seeking. At one point, the male protagonist encourages the audience to do the same by saying: "It is important to seek help […]. To get rid of those [suicidal] thoughts, you have to talk to someone.
[…] Now I know that every human life matters. Mine too.
[…] It takes a lot of time and effort. However, it pays off". This clearly links his personal mastery of suicidal ideation to his help-seeking efforts.

Strengths and limitations
Strengths of this study include the RCT design with a sufficient number of participants and very low dropouts, and blinding was successful. Furthermore, the study was conducted on-site rather than online, increasing its validity [36], and differences between the intervention and the control video were minimal regarding stylistic means. Finally, the assessment included a 4-week follow-up to test for the sustainability of the effects, rather than only immediate effects like in previous studies [5,10,18].
The study had some limitations. First, the sample size was only appropriate to detect medium-sized effects. Only a small number of participants watched the video multiple times, so we were not able to calculate effects of repeated exposure. Female adolescents were overrepresented in the study sample. Further, participants were exposed to one intervention video only, and materials should be tailored specifically to various groups, e.g., girls [37]. However, gender patterns suggested that girls/women did not feel less addressed by the male protagonist, but scored better on helpseeking intentions than boys/men. Outcome measures did not capture actual behavior (i.e., suicidal behavior or helpseeking behaviors), which would require larger sample sizes and longer follow-up. Finally, the present sample included a number of youth with some degree of vulnerability to suicide, but it remains unknown if the effects generalize to clinical samples at risk of suicide.

Conclusion
Adolescents appear to benefit from personal video narratives featuring adolescents who master their suicidal crises and emphasize help-seeking, consistent with the Papageno effect [7]. Suicide prevention videos developed by and for adolescents appear to be safe and effective in reducing some risk factors for suicide. These findings should serve as a bold encouragement for public health and school authorities to implement similar projects that put young people in charge of the development of media interventions for suicide prevention.
Author contributions TN formulated the research question and conceptualized the study. TN, MB, and BT contributed to the design of the study. MB carried out the study. MB performed the statistical analysis, supervised by TN. MB wrote the first draft of the manuscript. MB, BT, JP, and TN contributed to manuscript revision, read, and approved the submitted version.
Funding Open access funding provided by Medical University of Vienna. This project is funded by the FWF (Austrian Science Fund, project number: KLI 627).

Data availability
The data from this study are available from the corresponding author upon reasonable request.

Conflicts of interest
The authors declare that they have no conflict of interest.
Ethics approval All procedures contributing to this work comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008. All procedures involving human participants were approved by the research ethics board at the Medical University of Vienna (study protocol 1033/2015).
Consent to participate Individual written consent was sought from all participants and for minors additionally from parents.

Consent for publication
The participants provided informed consent for publication of anonymized data.
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