Depressive symptoms, mental wellbeing, and substance use among adolescents before and during the COVID-19 pandemic in Iceland: a longitudinal, population-based studyIngibjörg Eva Þórisdóttir, Thorhildur Halldorsdottir, Bryndís Björk Ásgeirsdóttir et al.|The Lancet Psychiatry|2021Cited by 302
Adolescent well‐being amid the COVID‐19 pandemic: Are girls struggling more than boys?Thorhildur Halldorsdottir, Inga Dóra Sigfúsdóttir, Heiðdís Valdimarsdóttir et al.|JCPP Advances|2021Cited by 113
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 studyIngibjörg Eva Þórisdóttir, Thorhildur Halldorsdottir, Gudjon Agustsson et al.|The Lancet Child & Adolescent Health|2023Cited by 56
Adolescent mental health before, during, and after the COVID-19 pandemic in Iceland: a repeated, cross-sectional, population-based studyErin Haskell, Thorhildur Halldorsdottir, Berglind Sigmarsdottir et al.|The Lancet Regional Health - Europe|2025Cited by 11
A multi-level developmental approach towards understanding adolescent mental health and behaviour: rationale, design and methods of the LIFECOURSE study in IcelandThorhildur Halldorsdottir, Inga Dóra Sigfúsdóttir, Álfgeir L. Kristjánsson et al.|Social Psychiatry and Psychiatric Epidemiology|2020Cited by 7