1. Adolescent substance use and peer use: a multilevel analysis of cross-sectional population data Kristjansson, Alfgeir L.; Sigfusdottir, Inga Dora; Allegrante, John P. 2013 Articles Public healthEpidemiology
2. Maternal smoking during pregnancy and scholastic achievement in childhood: evidence from the LIFECOURSE cohort study Kristjansson, Alfgeir L.; Thorisdottir, Ingibjorg E.; Allegrante, John P.; Lilly, Christa L.; Sigfusdottir, Inga Dora 2017 Articles Academic achievementChild developmentPrenatal influencesPregnant women--Tobacco useCohort analysis
3. Stress and adolescent well-being: the need for an interdisciplinary framework Sigfusdottir, Inga Dora; Kristjansson, Alfgeir L.; Thorlindsson, Thorolfur; Allegrante, John P. 2017 Articles Stress (Psychology)TeenagersStress in adolescenceInterdisciplinary research
4. The increase in symptoms of anxiety and depressed mood among Icelandic adolescents: time trend between 2006 and 2016 Thorisdottir, Ingibjorg E.; Asgeirsdottir, Bryndis Bjork; Sigurvinsdottir, Rannveig; Allegrante, John P.; Sigfusdottir, Inga Dora 2017 Articles TeenagersTeenagers--Mental healthAnxietyDepression, MentalEpidemiology
5. Perceived parental reactions to substance use among adolescent vapers compared with tobacco smokers and non-users in Iceland Kristjansson, Alfgeir L.; Allegrante, John P.; Sigfusdottir, Inga Dora 2018 Articles Teenagers--Substance useTeenagers--Substance use--Psychological aspectsParent and childVapingSmoking
6. Do population trends in adolescent electronic cigarette use coincide with changes in prevalence of cigarette smoking? Kristjansson, Alfgeir L.; Allegrante, John P.; Sigfusson, Jon; Sigfusdottir, Inga Dora 2019 Articles TeenagersTeenagers--Health and hygieneElectronic cigarettesSmoking
7. Active and Passive Social Media Use and Symptoms of Anxiety and Depressed Mood Among Icelandic Adolescents Thorisdottir, Ingibjorg E.; Sigurvinsdottir, Rannveig; Asgeirsdottir, Bryndis Bjork; Allegrante, John P.; Sigfusdottir, Inga Dora 2020 Articles TeenagersSocial mediaAnxietyDepression, MentalPsychology
8. A multi-level developmental approach towards understanding adolescent mental health and behaviour: rationale, design and methods of the LIFECOURSE study in Iceland Halldorsdottir, Thorhildur; Kristjansson, Alfgeir L.; Asgeirsdottir, Bryndis Bjork; Thorisdottir, Ingibjorg E.; Sigfusson, Jon; Jonsdottir Tolgyes, Erla Maria; Valdimarsdottir, Heiddis; Allegrante, John P.; Sigfusdottir, Inga Dora 2020 Articles Teenagers--Mental healthBehavioral assessment of teenagerResearch--MethodologyChild development--Research--Methodology
9. Cumulative risk over the early life course and its relation to academic achievement in childhood and early adolescence Ragnarsdottir, Laufey Dís; Kristjansson, Alfgeir L.; Thorisdottir, Ingibjorg E.; Allegrante, John P.; Valdimarsdottir, Heiddis; Gestsdottir, Steinunn; Sigfusdottir, Inga Dora 2020 Articles Academic achievementChild developmentChildren--Family relationshipsChildren--Health and hygieneRisk
10. Development and Guiding Principles of the Icelandic Model for Preventing Adolescent Substance Use Kristjansson, Alfgeir L.; Mann, Michael J.; Sigfusson, Jon; Thorisdottir, Ingibjorg E.; Allegrante, John P.; Sigfusdottir, Inga Dora 2020 Articles Substance abuse--PreventionYouth--Substance use--PreventionTeenagersHealth education