Social media use has increased substantially over the past decades, especially among adolescents. A proportion of adolescents develop a pattern of problematic social media use (PSMU). Predictors of PSMU are insufficiently understood and researched. This study aims to investigate predictors of PSMU in a nationally representative sample of adolescents in Luxembourg. Data from the Health Behavior in School-aged Children (HBSC) study in Luxembourg were used, in which 8687 students aged 11–18 years old participated. The data were analyzed using hierarchical multiple regression. A range of sociodemographic, social support, well-being and media use predictors were added to the model in four blocks. The predictors in the final model explained 22.3% of the variance in PSMU. The block of sociodemographic predictors explained the lowest proportion of variance in PSMU compared with the other blocks. Age negatively predicted PSMU. Of the predictors related to social support, cyberbullying perpetration was the strongest predictor of PSMU. Perceived stress and psychosomatic complaints positively predicted PSMU. The intensity of electronic media communication and preference for online social interaction were stronger predictors of PSMU than the other predictors in the model. The results indicate that prevention efforts need to consider the diverse range of predictors related to PSMU.

Background: Suicide is the second leading cause of death for young people worldwide. A significant amount of suicide attempts is known to be unplanned, but research on unplanned attempts among adolescents is limited. As knowledge on the profile of unplanned suicide attempts is crucial for effective prevention efforts, this study aims to characterize and compare three suicide behaviour profiles among adolescents: planned attempts, unplanned attempts and ideation without attempt. Methods: Data from the 2014 Luxembourgish Health Behaviour in School-aged Children study was used. 879 adolescents aged 12 to 18 years old are included in this study. Data was gathered using paper questionnaires. ANOVAs with Games-Howell post-hoc tests were conducted for 18 independent variables, using the suicide behaviour variable as the dependent variable. Results: Unplanned attempters report higher levels of parental and classmate support (p < 0.01), fewer health complaints (p < 0.001), higher life satisfaction (p < 0.01) and a more positive body image (p < 0.01) than planned attempters and ideators. Unplanned and planned attempters are younger than ideators (p < 0.01) and report more substance use and physical fighting than ideators (p < 0.01). Conclusions: Unplanned attempters report better health (behaviour) and more social support than planned attempters and ideators. Unplanned attempters and planned attempters have higher levels of risk behaviour than ideators. Prevention efforts should be mindful of similarities and differences between the behaviours, and identify and address at risk adolescents accordingly. Key messages: Unplanned attempters have better health (behaviour) and more social support than planned attempters and ideators. Results are incorporated in the Luxembourgish national plan for suicide prevention.

Issue: As suicide is the second leading cause of death for young people, WHO aims to reduce the suicide rate with 10% by 2020 worldwide. In Luxembourg, organization D’Ligue coordinates suicide prevention. Since suicide research has been carried out in the country for a few years only, data on adolescent suicidal ideation is lacking. Therefore, D’Ligue has contacted the Luxembourg team of the international Health Behaviour in School-aged Children (HBSC) study, to identify risk factors for suicide behaviour and derive recommendations from them. Description of the problem: First, our practice partner wanted us to provide them with basic data on the suicidal ideation of adolescents: How many adolescents are suicidal and what are risk factors? Second, recommendations for practice should be derived from the results. To this end, the HBSC data (2014) of 5262 pupils aged 12-18 were analysed. Results: 15.1% of adolescents thought about suicide last year and 7% attempted suicide. Of the 24 risk factors examined, 12 were found to be significant, with three being particularly important: multiple health complaints (OR: 1.3 for each health complaint, p < 0.001, CI: 1.18 - 1.33), lower life satisfaction (OR: 1.3 for the loss of each life satisfaction point, p < 0.001, CI: 1.17 - 1.33) and frequent physical fighting (OR: 2.4, p < 0.001, CI: 1.57 - 3.74). Lessons: Risk factors for suicide behaviour known from research have been confirmed for Luxembourg. What is new is that the number of health complaints is the most important risk factor for Luxembourgish adolescents. Therefore, a list of 8 health complaints was validated as a screening tool for suicidal thoughts. In a further step, this tool could be used, for example, by school nurses. The HBSC data can be used to update the national suicide prevention plan. Main messages: HBSC data are used to: update the Luxembourgish national plan for suicide prevention.investigate a screening tool for adolescents at risk for suicide.