Depressive symptoms, mental wellbeing, and substance use among adolescents before and during the COVID-19 pandemic in Iceland: a longitudinal, population-based study von Thorisdottir, Ingibjorg Eva, Asgeirsdottir, Bryndis Bjork, Kristjansson, Alfgeir Logi, Valdimarsdottir, Heiddis Bjork, Jonsdottir Tolgyes, Erla Maria, Sigfusson, Jon, Allegrante, John Philip, Sigfusdottir, Inga Dora, Halldorsdottir, Thorhildur

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Health Behavior and Academic Achievement Among Adolescents: The Relative Contribution of Dietary Habits, Physical Activity, Body Mass Index, and Self-Esteem von Kristjánsson, Álfgeir Logi, Sigfúsdóttir, Inga Dora, Allegrante, John P.

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Adolescent substance use, sleep, and academic achievement: Evidence of harm due to caffeine von James, Jack E, Kristjánsson, Álfgeir Logi, Sigfúsdóttir, Inga Dóra

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Psychological Well-Being of Sexual Minority Young Adults in Iceland: Assessing Differences by Sexual Attraction and Gender von Gisladottir, Berglind, Gronfeldt, Bjarki, Kristjansson, Alfgeir Logi, Sigfusdottir, Inga Dora

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Trends in substance use and primary prevention variables among adolescents in Lithuania, 2006-19 von Asgeirsdottir, Bryndis Bjork, Kristjansson, Alfgeir Logi, Sigfusson, Jon, Allegrante, John P., Sigfusdottir, Inga Dora

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Health behaviour and academic achievement in Icelandic school children von Sigfúsdóttir, Inga Dóra, Kristjánsson, Álfgeir Logi, Allegrante, John P.

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A multi-level developmental approach towards understanding adolescent mental health and behaviour: rationale, design and methods of the LIFECOURSE study in Iceland von Halldorsdottir, Thorhildur, Kristjansson, Alfgeir Logi, Asgeirsdottir, Bryndis Bjork, Thorisdottir, Ingibjorg Eva, Sigfusson, Jon, Tolgyes, Erla Maria Jonsdottir, Valdimarsdottir, Heiddis B., Allegrante, John, Sigfusdottir, Inga Dora

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Adolescent well‐being amid the COVID‐19 pandemic: Are girls struggling more than boys? von Halldorsdottir, Thorhildur, Thorisdottir, Ingibjorg Eva, Meyers, Caine C. A., Asgeirsdottir, Bryndis Bjork, Kristjansson, Alfgeir Logi, Valdimarsdottir, Heiddis B., Allegrante, John P., Sigfusdottir, Inga Dora

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Substance use prevention for adolescents: the Icelandic Model von Sigfúsdóttir, Inga Dóra, Thorlindsson, Thorolfur, Kristjánsson, Álfgeir Logi, Roe, Kathleen M., Allegrante, John P.

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Intrafamilial conflict and emotional well-being: A population based study among Icelandic adolescents von Gunnlaugsson, Geir, Kristjánsson, Álfgeir Logi, Einarsdóttir, Jónína, Sigfúsdóttir, Inga Dóra

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Substance Use Among Youth During the COVID-19 Pandemic: a Systematic Review von Layman, Hannah M., Thorisdottir, Ingibjorg Eva, Halldorsdottir, Thorhildur, Sigfusdottir, Inga Dora, Allegrante, John P., Kristjansson, Alfgeir Logi

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Stress and adolescent well-being: the need for an interdisciplinary framework von Sigfusdottir, Inga Dora, Kristjansson, Alfgeir Logi, Thorlindsson, Thorolfur, Allegrante, John P.

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Data Collection Procedures for School-Based Surveys Among Adolescents: The Youth in Europe Study von Kristjansson, Alfgeir Logi, Sigfusson, Jon, Sigfusdottir, Inga Dora, Allegrante, John P.

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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 von Thorisdottir, Ingibjorg Eva, Agustsson, Gudjon, Oskarsdottir, Saeunn Yr, Kristjansson, Alfgeir Logi, Asgeirsdottir, Bryndis Bjork, Sigfusdottir, Inga Dora, Valdimarsdottir, Heiddis Bjork, Allegrante, John Philip, Halldorsdottir, Thorhildur

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A comparative analysis of general strain theory von Sigfusdottir, Inga Dora, Kristjansson, Alfgeir Logi, Agnew, Robert

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Adolescent substance use, parental monitoring, and leisure-time activities: 12-year outcomes of primary prevention in Iceland von Kristjansson, Alfgeir Logi, James, Jack E, Allegrante, John P, Sigfusdottir, Inga Dora, Helgason, Asgeir R

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Body weight dissatisfaction in the Icelandic adult population: a normative discontent? von Matthiasdottir, Erna, Jonsson, Stefan Hrafn, Kristjansson, Alfgeir Logi

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The Role of Parental Support, Parental Monitoring, and Time Spent With Parents in Adolescent Academic Achievement in Iceland: A Structural Model of Gender Differences von Kristjansson, Alfgeir Logi, Sigfusdottir, Inga Dora

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Adolescent substance use and peer use: a multilevel analysis of cross-sectional population data von Kristjansson, Alfgeir Logi, Sigfusdottir, Inga Dora, Allegrante, John P

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Electronic screen use and mental well-being of 10-12-year-old children von Yang, Fei, Helgason, Asgeir R, Sigfusdottir, Inga Dora, Kristjansson, Alfgeir Logi

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