Sexual Attraction and Non-Suicidal Self-Harm: The Role of Stressors and Psychological Mediators.

Non-suicidal self-harm (NSSH) is a serious concern for the well-being of youth. Stressors relate to greater NSSH risk, such as being non-heterosexual in a heteronormative society. Other stressors may include traumatic experiences. These relationships may be mediated by psychological factors (depressed mood, anxiety, anger, and self-esteem) as well as contextual factors (support from parents and peers). The purpose of this study was to examine NSHH ideation and behavior among Icelandic youth, as well as relationships with stressors and mediators. Students in Icelandic high schools (N = 8921, 50.8% female) completed an in-class survey in the year 2016. Results showed an elevated risk of NSSH ideation and behavior among bisexual and homosexual youth. Mediation analyses showed that, for girls, being bisexual related to greater NSSH ideation and behavior, and these relationships were mediated by depressed mood, anger, and self-esteem, as well as by support from parents and peers. For boys, however, both homosexual and bisexual attraction related to greater risk for NSSH ideation and behavior, which was mediated by depressed mood, anger, and self-esteem. These results suggest that NSSH risk factors vary by gender and, therefore, they may benefit from different interventions to stop and prevent this behavior. This is the first study of its kind in Iceland, where sexual minority stress may need further study within the Nordic context.

Preliminary impact of the adoption of the Icelandic Prevention Model in Tarragona City, 2015-2019: A repeated cross-sectional study.

Background: There is a great need for effective primary prevention intervention strategies to reduce and delay onset of adolescent substance use. The Icelandic Prevention Model (IPM) showed great success in Iceland over the past twenty plus years, however, evidence for the transferability of model is still somewhat limited. Using data collected in Tarragona during regional efforts to begin adoption of the IPM in Catalonia, this study tested the transferability and stability of the core risk and protective factor assumptions of the IPM overtime and examined trends of lifetime smoking, e-cigarette-use, alcohol-use, intoxication, and cannabis-use within the same time period. Methods: This study includes responses from 15- to 16-years-olds from two region-wide samples taken in 2015 and 2019 in Tarragona (N = 2,867). Survey questions assessed frequency of lifetime: smoking, e-cigarette-use, alcohol-use, intoxication, and cannabis-use, and the core model assumptions. Demographic data were also collected. Logistic regression models of main effects with and without time interaction were used to test assumptions and their stability across time. Chi-square tests and Wilcoxon-Mann-Whitney U tests were used to compare prevalence of substance use and mean scores of primary prevention variables respectively. Results: Lifetime: smoking (-7%, p < 0.001) and cannabis-use (-4%, p < 0.001) decreased, and e-cigarette-use increased (+33%, p < 0.001) in Tarragona. Lifetime intoxication (-7%, p < 0.001) decreased in a single zone exclusively. Most core model assumptions held in their hypothesised direction across time. The strongest positive association was observed between time spent with parents during weekends and reduced odds of lifetime smoking (OR: 0.62, 95%CI: 0.57-0.67) and the strongest negative association was observed between being outside after midnight and increased odds of lifetime intoxication (OR: 1.41, 95%CI: 1.32-1.51). Mean scores of primary prevention variables also changed disproportionately in Tarragona. Conclusion: This study confirms that the core IPM assumptions are similar in Tarragona as in Iceland and other contexts previously examined. They also indicate that prevalence of lifetime smoking, intoxication, and cannabis-use decreased disproportionately in Tarragona between 2015 and 2019 during the first phase of regional adoption of the model. Thus, targeting model assumptions represents a viable primary prevention strategy for communities that hope to reduce smoking, alcohol-use, intoxication, and cannabis-use among adolescents.

Effect of the COVID-19 pandemic on adolescent mental health and substance use up to March, 2022, in Iceland: a repeated, cross-sectional, population-based study.

BACKGROUND: Poor mental health in the first year of the COVID-19 pandemic has been well documented in adolescents; however, less is known about the longer-term effect of the pandemic. We aimed to examine adolescent mental health and substance use as well as covariates associated with these outcomes 1 year or more into the pandemic. METHODS: A nationwide sample of adolescents aged 13-18 years enrolled in school in Iceland were invited to complete surveys administered during October-November or February-March, 2018, October-November, 2020, February-March or October-November, 2021, and February-March 2022. The survey was in Icelandic for all administrations and offered to adolescents aged 13-15 years in English in 2020 and 2022 and in Polish in 2022. Surveys assessed depressive symptoms (Symptom Checklist-90); mental wellbeing (Short Warwick Edinburgh Mental Wellbeing Scale); and the frequency of cigarette smoking, e-cigarette use, and alcohol intoxication. Covariates comprised age, gender, and migration status as determined by language spoken at home, level of social restrictions based on residency, parental social support, and sleep duration (≥8 h nightly). Weighted mixed-effect models were used to determine the effect of time and the covariates on mental health and substance use. The main outcomes were assessed in all participants with more than 80% of the necessary data, and multiple imputation was used to handle missing data. Bonferroni corrections were used to adjust for multiple testing and analyses were considered significant at a p value of <0·0017. FINDINGS: 64 071 responses were submitted and analysed between 2018 and 2022. Elevated depressive symptoms and worsened mental wellbeing across girls and boys aged 13-18 years were observed to have been maintained up to 2 years into the pandemic (p>0·0017). Alcohol intoxication initially decreased during the pandemic but increased again as social restrictions eased (p<0·0001). No changes were observed in cigarette smoking and e-cigarette use during the COVID-19 pandemic. Higher levels of parental social support and an average sleep duration of 8 h or more per night were associated with mental health better outcomes and less substance use (p<0·0001). Social restrictions and migration background were inconsistently associated with the outcomes. INTERPRETATION: Population-level prevention targeting adolescent depressive symptoms should be prioritised in health policy in the wake of COVID-19. FUNDING: Icelandic Research Fund.

Conducting national burden of disease studies and knowledge translation in eight small European states: challenges and opportunities.

BACKGROUND: Several countries across Europe are engaging in burden of disease (BoD) studies. This article aims to understand the experiences of eight small European states in relation to their research opportunities and challenges in conducting national BoD studies and in knowledge translation of research outputs to policy-making. METHODS: Countries participating in the study were those outlined by the WHO/Europe Small Countries Initiative and members of the Cooperation in Science and Technology (COST) Action CA18218 European Burden of Disease Network. A set of key questions targeting the research landscape were distributed to these members. WHO's framework approach for research development capacities was applied to gain a comprehensive understanding of shortages in relation to national BoD studies in order to help strengthen health research capacities in the small states of Europe. RESULTS: Most small states lack the resources and expertise to conduct BoD studies, but nationally representative data are relatively accessible. Public health officials and researchers tend to have a close-knit relationship with the governing body and policy-makers. The major challenge faced by small states is in knowledge generation and transfer rather than knowledge translation. Nevertheless, some policy-makers fail to make adequate use of knowledge translation. CONCLUSIONS: Small states, if equipped with adequate resources, may have the capacity to conduct national BoD studies. This work can serve as a model for identifying current gaps and opportunities in each of the eight small European countries, as well as a guide for translating country BoD study results into health policy.

Substance Use Among Youth During the COVID-19 Pandemic: a Systematic Review.

PURPOSE OF REVIEW: To review the literature on the trends in substance use among youth during the coronavirus SARS-CoV-2 (COVID-19) pandemic. RECENT FINDINGS: The pandemic has given rise to concerns about the mental health and social well-being of youth, including its potential to increase or exacerbate substance use behaviors. This systematic review identified and included 49 studies of use across alcohol, cannabis, tobacco, e-cigarettes/vaping, and other drugs, and unspecified substances. The majority of studies across all categories of youth substance use reported reductions in prevalence, except in the case of other drugs and unspecified drug and substance use, which included three studies that reported an increase in use and three studies that reported decrease in use. Overall, the results of this review suggest that the prevalence of youth substance use has largely declined during the pandemic. Youth substance use in the post-pandemic years will require monitoring and continued surveillance.

A year of Covid-19: experiences and lessons learnt by small European island states-Cyprus, Iceland and Malta.

BACKGROUND: COVID-19 became a global pandemic within weeks, as every country including small states and islands experienced a surge in cases. Small islands are known to face several challenges in the quest to curb the viral spread, but with the absence of land boarders and small population size, these factors should have played to their advantage to minimize the spread. The aim of this article was to compare and contrast the COVID-19 situation, restrictions, preparedness, management and the healthcare systems between the small population island states of Cyprus, Iceland and Malta. METHODS: Data were obtained from Ministry of Health websites and COVID dashboards of the three respective Island states in Europe. Comparisons were made between the reported cases, deaths, excess deaths, years of life lost, swabbing rates, restrictive measures, vaccination roll-out and healthcare system structures. RESULTS: Cyprus and Malta contained the COVID-19 spread better than Iceland during the first wave. However, a significantly higher viral spread and mortality rates were observed in Malta during the second waves. Similar healthcare preparedness and services, restrictions and relaxation measures were implemented across the three islands with some exceptions. Covid-19 vaccination has initiated across all Islands with Malta leading the vaccination roll-out. CONCLUSION: The small population size and island status proved to be an asset during the first wave of COVID-19, but different governance approaches led to a different COVID-19 outcomes, including high mortality rates during the transition phases and the subsequent waves.

Adolescent well-being amid the COVID-19 pandemic: Are girls struggling more than boys?

BACKGROUND: Differential effects of the coronavirus SARS-CoV-2 (COVID-19) pandemic and associated public restrictions on adolescent girls and boys are emerging but have not been elucidated. This study examined gender differences across broad indicators of adolescent well-being during the COVID-19 pandemic in Iceland, and explored potential explanations for these differences. METHODS: In total, 523 youth (56.5% girls) born in Iceland in 2004 completed measures on mental health problems (depressive symptoms, anger and suicide attempts) and measures designed for this study to assess broad indicators of adolescent well-being (e.g., day-to-day life, academic performance, family and peer relationships, and mental and physical health) and behavioral changes during the COVID-19 pandemic. Mental health problems during the pandemic were compared to expected scores based on nationwide ratings of same-aged peers in 2018. RESULTS: Although both boys and girls appeared affected, girls reported a greater negative impact across all the broad indicators of well-being and behavioral change during COVID-19 than boys, and their depressive symptoms were above and beyond the expected nationwide scores (t(1514) = 4.80, p < .001, Cohen's d = 0.315). Higher depressive symptoms were associated with increased passive social media use and decreased connecting with family members via telephone or social media among girls, and decreased sleeping and increased online gaming alone among boys. Concern about others contracting COVID-19, changes in daily and school routines, and not seeing friends in person were among the primary contributors to poor mental health identified by youth, particularly girls. CONCLUSIONS: Adolescents were broadly negatively affected by the COVID-19 pandemic and accompanying restrictions; however, this negative impact was more pronounced in girls. The findings suggest that a steady routine and remaining socially connected may help youth cope with the uncertainty and social restrictions associated with a pandemic. Moreover, healthcare providers, teachers, and other professionals should pay close attention to depressive symptoms among girls during a pandemic.

Depressive symptoms, mental wellbeing, and substance use among adolescents before and during the COVID-19 pandemic in Iceland: a longitudinal, population-based study.

BACKGROUND: Adolescence represents a crucial developmental period in shaping mental health trajectories. In this study, we investigated the effect of the COVID-19 pandemic on mental health and substance use during this sensitive developmental stage. METHODS: In this longitudinal, population-based study, surveys were administered to a nationwide sample of 13-18-year-olds in Iceland in October or February in 2016 and 2018, and in October, 2020 (during the COVID-19 pandemic). The surveys assessed depressive symptoms with the Symptom Checklist-90, mental wellbeing with the Short Warwick Edinburgh Mental Wellbeing Scale, and the frequency of cigarette smoking, e-cigarette use, and alcohol intoxication. Demographic data were collected, which included language spoken at home although not ethnicity data. We used mixed effects models to study the effect of gender, age, and survey year on trends in mental health outcomes. FINDINGS: 59 701 survey responses were included; response rates ranged from 63% to 86%. An increase in depressive symptoms (ß 0·57, 95% CI 0·53 to 0·60) and worsened mental wellbeing (ß -0·46, 95% CI -0·49 to -0·42) were observed across all age groups during the pandemic compared with same-aged peers before COVID-19. These outcomes were significantly worse in adolescent girls compared with boys (ß 4·16, 95% CI 4·05 to 4·28, and ß -1·13, 95% CI -1·23 to -1·03, respectively). Cigarette smoking (OR 2·61, 95% CI 2·59 to 2·66), e-cigarette use (OR 2·61, 95% CI 2·59 to 2·64), and alcohol intoxication (OR 2·59, 95% CI 2·56 to 2·64) declined among 15-18-year-olds during COVID-19, with no similar gender differences. INTERPRETATION: Our results suggest that COVID-19 has significantly impaired adolescent mental health. However, the decrease observed in substance use during the pandemic might be an unintended benefit of isolation, and might serve as a protective factor against future substance use disorders and dependence. Population-level prevention efforts, especially for girls, are warranted. FUNDING: Icelandic Research Fund. TRANSLATION: For the Icelandic translation of the abstract see Supplementary Materials section.

Conducting national burden of disease studies in small countries in Europe- a feasible challenge?

BACKGROUND: Burden of Disease (BoD) studies use disability-adjusted life years (DALYs) as a population health metric to quantify the years of life lost due to morbidity and premature mortality for diseases, injuries and risk factors occurring in a region or a country. Small countries usually face a number of challenges to conduct epidemiological studies, such as national BoD studies, due to the lack of specific expertise and resources or absence of adequate data. Considering Europe's small countries of Cyprus, Iceland, Luxembourg, Malta and Montenegro, the aim was to assess whether the various national data sources identified are appropriate to perform national BoD studies. MAIN BODY: The five small countries have a well-established mortality registers following the ICD10 classification, which makes calculation of years of life lost (YLL) feasible. A number of health information data sources were identified in each country, which can provide prevalence data for the calculation of years lived with disability (YLD) for various conditions. These sources include disease-specific registers, hospital discharge data, primary health care data and epidemiological studies, provided by different organisations such as health directorates, institutes of public health, statistical offices and other bodies. Hence, DALYs can be estimated at a national level through the combination of the YLL and YLD information. On the other hand, small countries face unique challenges such as difficulty to ensure sample representativeness, variations in prevalence estimates especially for rarer diseases, existence of a substantial proportion of non-residents affiliated to healthcare systems and potential exclusion from some European or international initiatives. Recently established BoD networks may provide a platform for small countries to share experiences, expertise, and engage with countries and institutions that have long-standing experience with BoD assessment. CONCLUSION: Apart from mortality registries, adequate health data sources, notably for cancer, are potentially available at the small states to perform national BoD studies. Investing in sharing expert knowledge through engagement of researchers in BoD networks can enable the conduct of country specific BoD studies and the establishment of more accurate DALYs estimates. Such estimates can enable local policymakers to reflect on the relative burden of the different conditions that are contributing to morbidity and mortality at a country level.

Mental Health, Academic Engagement, and Youths' Nonmedical Use of Stimulants: A Latent Profile Analysis.

BACKGROUND:: Nonmedical prescription stimulant (NPS) use is a growing problem in Europe. Poor mental health and lack of academic engagement are potent sources of risk for substance use. Studies suggest that considerable heterogeneity may characterize the risk profiles of NPS users. To understand better the potential profiles of risk that characterize NPS users, we conducted a latent profile analysis (LPA) to document subgroups of users based on their mental health and academic engagement. METHODS:: A nationally representative, cross sectional survey of Icelandic youth was analyzed. The sample included 584 (5% of the sample) older adolescent students participating in a national study in Iceland who reported lifetime NPS use. RESULTS:: Three subgroups of NPS users emerged from our analyses. The largest subgroup (43.1%) we labeled mentally healthy achievers; youth who appear to be academically motivated and have few if any mental health concerns. The second largest group (40.4%), low achievers, resembled a typical profile for drug users in that they reported low or modest academic engagement and moderate levels of mental health concerns. The third group, anxious achievers (16.5%) appears to represent youth who felt academics were very important, had moderate study motivation, and also reported elevated mental health concerns, especially anxiety. CONCLUSIONS:: LPA revealed considerable heterogeneity among these users. Group membership suggests distinct approaches to prevention to address heterogeneity in motivations for NPS use.

Testing risk and protective factor assumptions in the Icelandic model of adolescent substance use prevention.

Iceland has witnessed a dramatic decline in adolescent substance use that may be partly the result of efforts related to the Icelandic prevention model (IPM). We sought to test risk and protective factor assumptions of the IPM using a prospective cohort study with 12 months separating baseline from follow-up. Participants were students in grades 8 and 9 in the national Icelandic school system enrolled in the spring of 2018 and 2019 (N=2165). Participants self-reported their experiences of cigarette smoking, alcohol consumption, and cannabis use and seven risk and protective factors. Analyses were conducted with generalized linear modeling with extension to general estimating equations with correlated outcomes data. Both individual main-effects models and collective models including all main-effects were tested. Out of 28 individual main-effects models, 23 produced findings consistent with study premises (P<0.05). Multiple main-effects models largely sustained the findings of the individual main-effects models. Findings support the assumption that the risk and protective factors commonly emphasized in the IPM are associated with the four different substance use outcomes in the hypothesized direction. Communities that plan to implement the IPM among adolescents might consider these factors in their work.

Adolescent caffeine consumption and aggressive behavior: A longitudinal assessment.

Background: Adolescent caffeine consumption has been linked to aggressive behaviors, although no longitudinal tests have been reported to date. The purpose of this study was to test the longitudinal relations between daily adolescent caffeine consumption and aggressive behaviors. Methods: Two waves of survey data collected 12 months apart in the spring of 2018 and 2019, from the 2004 birth cohort in the Icelandic LIFECOURSE study, were analyzed using structural equation modeling (N = 2,278). Both direct and mediated models were employed. Results: Caffeine use at time 1 (T1) was associated with aggressive behavior at time 2 (T2) (ß = .12, p < .001) independent of aggressive behavior at T1. A considerable added relation was observed between caffeine at T1 and aggressive behavior at T2 via indirect (i.e., mediated) effects of aggressive behavior at T1 (standardized ß = .20, p < .001). Over 64% of the standardized total effect (ß = .31) observed between caffeine at T1 and aggressive behavior at T2 was due to mediation. Conclusion: Adolescent caffeine consumption forecasts aggressive behaviors. Caffeine use at T1 increased the likelihood of self-reported aggressive behaviors 12 months later irrespective of level of reported aggressive behavior at T1 while controlling for common confounders.

The Impact of Sexual Abuse, Family Violence/Conflict, Spirituality, and Religion on Anger and Depressed Mood Among Adolescents.

Stressful life experiences, such as sexual abuse and family violence/conflict, relate to an increased risk of mental health problems. Religion and spirituality may prevent this negative impact, but religion and spirituality are lower among survivors of stressful life experiences. To explore this effect, we examined the relationship between childhood sexual abuse and family violence/conflict on anger and depressed mood. Survey data were collected from a large population-based sample of Icelandic adolescents (N = 7,365) on their stressful life experiences, religion, spirituality, and mental health. Survivors of stressful life experiences (sexual abuse or family violence/conflict) were significantly lower on religion and spirituality than others. A hierarchical linear regression showed that stressful life experiences contributed uniquely to higher levels of anger and depressed mood. Spirituality was associated with decreased anger and depressed mood. The religion of parents and peers was also associated with decreased anger. Religious participation, on the contrary, did not have a relationship with mental health outcomes. In addition, the negative association between spirituality and anger was stronger among survivors of sexual abuse than nonabused individuals. These results confirm previous research, indicating that survivors of stressful life experiences may experience less religion and spirituality. The results also extend existing knowledge by showing that spirituality may be even more beneficial among sexual abuse survivors, as a protective factor against anger. These findings can help in the minimization of the negative mental health impact of stressful life experiences.

Trends in substance use and primary prevention variables among adolescents in Lithuania, 2006-19.

BACKGROUND: Since the implementation of the Icelandic Model for Primary Prevention of Substance Use in Iceland (IPM), substance use has decreased steadily among 14-16-year-old adolescents and primary prevention factors have improved. Although the IPM is being implemented in several other regions around the world, information documenting its effectiveness in other country contexts is lacking. This study assessed trends in substance use and primary prevention variables in three cities in Lithuania following the implementation of the IPM. METHODS: Data collected from repeated, comparative cross-sectional self-report surveys conducted among a total of 30 572 10th graders in the cities of Kaunas, Klaipeda and Vilnius, Lithuania, from 2006 to 2019, were analyzed. Cochran-Armitage test for linear trend and analysis of variance for linear trend was used to assess time-trends in prevalence of substance use and mean levels of primary prevention variables over time. RESULTS: Following the implementation of IPM rates of cigarette smoking and the use of alcohol, cannabis and amphetamine has decreased among 10th graders in Lithuania's three largest cities and simultaneously preventive variables targeted have improved. Similar to Iceland, primary prevention variables were related to substance use in the expected direction, with the exception of organized sports participation, which was not associated with less likelihood of alcohol, cannabis and amphetamine use. CONCLUSION: Trends in substance use and primary prevention variables following the implementation of the IPM are similar in the three cities in Lithuania as in Iceland. Further research is needed to better understand the mechanisms underlying these trends.

A multi-level developmental approach towards understanding adolescent mental health and behaviour: rationale, design and methods of the LIFECOURSE study in Iceland.

PURPOSE: Identifying and understanding modifiable risk and protective factors that can inform early detection and intervention to prevent adolescent emotional problems and harmful behaviours is among the most pressing modern-day public health challenges. This paper describes the rationale, objectives, methods, and anticipated outcomes of the LIFECOURSE study, a multi-level, bio-psychosocial prospective study designed to advance our understanding of factors that shape adolescent mental health and behaviour. METHODS: Conducted by the Icelandic Centre for Social Research and Analysis at Reykjavik University, LIFECOURSE is a longitudinal population-based developmental study of Icelandic adolescents born in 2004. The study utilizes a comprehensive multi-informant assessment of individual, societal and biological factors measured across the lifespan. Data assembly and collection were conducted from 2016-2020 and utilize both retrospective and prospective data sources: (a) retrospective registry data assembled from seven national databases, (b) prospectively collected social surveys and (c) biomarker samples. RESULTS: Of the 3914 eligible adolescents, 60.8% (n = 2378) provided informed parental consent and student assent to participate in the study, with approximately half of the participants being female (n = 1175, 49.4%) and the majority being born in the capital area (n = 1455; 61.2%). The coverage of available data from the national databases and participation in the social surveys ranged from 81.7 to 100%. CONCLUSIONS: Major gaps remain in our knowledge of how individual, societal and biological factors across the lifespan-from early life to adolescence-interact and shape the risk for emotional problems and harmful behaviours during adolescence. The LIFECOURSE study was designed to address this knowledge gap.

Prevalence, mental health and substance use of anabolic steroid users: a population-based study on young individuals.

Aims: The use of anabolic androgen steroids to enhance performance is not a modern phenomenon. However, the majority of today's anabolic androgen steroid users are not competitive athletes, but individuals who want to look leaner and muscular. This study aimed to examine the prevalence of anabolic androgen steroid use among young individuals and assess whether their mental health, lifestyle and substance use differ from non-anabolic androgen steroid users. Methods: A population-based study conducted in secondary schools, mean age was 17.3 years. A total of 10,259 participants (50% young women, 1% reported gender as 'other', 49% young men) answered questions on mental health, anabolic androgen steroid use, substance use and sports participation. Statistical analysis included descriptive statistics, t-test, χ2 and logistic regression. Results: The prevalence of anabolic androgen steroid use was 1.6%, and 78% of users were young men. Anabolic androgen steroid users had more anger issues, anxiety, depression, and their self-esteem was lower than among non-anabolic androgen steroid users (P<0.05). A larger proportion of anabolic androgen steroid users, 30%, had attempted suicide compared to 10% of non-users (χ2 (1, 9580) = 57.5, P<0.001). Proportionally, anabolic androgen steroid users were more likely to take medicine for mental health problems and misuse substances than non-users. Participation in non-organised sports, increased anger and body image were associated with increased odds of using anabolic androgen steroids. Conclusions: Anabolic androgen steroid use is a public health threat. It had an alarming effect on the life of individuals who report having used anabolic androgen steroids. Authorities, healthcare workers, parents and others working with young people need to be informed of the signs and risks of anabolic androgen steroid use to reduce future negative implications.

WITHDRAWN: Dealing with COVID-19 in small European island states: Cyprus, Iceland and Malta.

This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal.

Longitudinal association between social media use and psychological distress among adolescents.

This study aimed to examine in a longitudinal cohort design whether social media use among adolescents is related to symptoms of social anxiety, depressed mood, and physical symptoms of anxiety over time. As part of the LIFECOURSE study of risk and protective factors for healthy adolescent development, three waves of school-based surveys of adolescents born in Iceland in 2004 were analyzed. Of the 3914 eligible adolescents, 2378 gave informed consent. Complete responses for this study were collected from 2211 students at the first wave, with 2052 responding roughly 12 months later, and 2097 responding in year 3. Linear mixed-effects models were used to analyze time spent on social media in relation to psychological distress over time. More time spent on social media was weakly but significantly associated with increased symptoms of depressed mood, social anxiety and symptoms of physical anxiety over time. However, the effect size of these relationships suggest they may not be of clinical relevance. The relationship between time spent on social media and symptoms of depressed mood and physical symptoms of anxiety grew stronger over time, although it is not known if this relationship is causal. The relationship between time spent on social media and all outcomes of psychological distress were stronger for girls than boys and increased social media use had a positive relationship with symptoms of depressed mood over time. The relationships found in this study were relatively small and future studies need to focus on the clinical and public health significance of these effects.

Development and Guiding Principles of the Icelandic Model for Preventing Adolescent Substance Use.

Adolescent substance use-the consumption of alcohol, tobacco, and other harmful drugs-remains a persistent global problem and has presented ongoing challenges for public health authorities and society. In response to the high rates of adolescent substance use during the 1990s, Iceland has pioneered in the development of the Icelandic Model for Primary Prevention of Substance Use-a theory-based approach that has demonstrated effectiveness in reducing substance use in Iceland over the past 20 years. In an effort to document our approach and inform potentially replicable practice-based processes for implementation in other country settings, we outline in a two-part series of articles the background and theory, guiding principles of the approach, and the core steps used in the successful implementation of the model. In this article, we describe the background context, theoretical orientation, and development of the approach and briefly review published evaluation findings. In addition, we present the five guiding principles that underlie the Icelandic Prevention Model's approach to adolescent substance use prevention and discuss the accumulated evidence that supports effectiveness of the model. In a subsequent Part 2 article, we will identify and describe key processes and the 10 core steps of effective practice-based implementation of the model.

Implementing the Icelandic Model for Preventing Adolescent Substance Use.

This is the second in a two-part series of articles about the Icelandic Model for Primary Prevention of Substance Use (IPM) in this volume of Health Promotion Practice. IPM is a community collaborative approach that has demonstrated remarkable effectiveness in reducing substance use initiation among youth in Iceland over the past 20 years. While the first article focused attention on the background context, theoretical orientation, evaluation and evidence of effectiveness, and the five guiding principles of the model, this second article describes the 10 core steps to practical implementation. Steps 1 to 3 focus on building and maintaining community capacity for model implementation. Steps 4 to 6 focus on implementing a rigorous system of data collection, processing, dissemination, and translation of findings. Steps 7 to 9 are designed to focus community attention and to maximize community engagement in creating and sustaining a social environment in which young people become progressively less likely to engage in substance use, including demonstrative examples from Iceland. And Step 10 focuses on the iterative, repetitive, and long-term nature of the IPM and describes a predictable arc of implementation-related opportunities and challenges. The article is concluded with a brief discussion about potential variation in community factors for implementation.