Álfgeir L. Kristjánsson

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

Ingibjörg Eva Þórisdóttir, Bryndís Björk Ásgeirsdóttir, Álfgeir L. Kristjánsson et al. · The Lancet Psychiatry · 2021 · 296 citations · Full text

Psychological Co-morbidities, Substance Use, Population Youth +12

Health Behavior and Academic Achievement Among Adolescents: The Relative Contribution of Dietary Habits, Physical Activity, Body Mass Index, and Self-Esteem

Álfgeir L. Kristjánsson, Inga Dóra Sigfúsdóttir, John P. Allegrante · Health Education & Behavior · 2008 · 249 citations

Physical Activity, Adolescence, Psychology +16

Health behaviour and academic achievement in Icelandic school children

Inga Dóra Sigfúsdóttir, Álfgeir L. Kristjánsson, John P. Allegrante · Health Education Research · 2006 · 215 citations · Full text

Physical Activity, Education, Family Structure +18

Substance use prevention for adolescents: the Icelandic Model

Inga D Sigfusdottir, Álfgeir L. Kristjánsson, Kathleen M. Roe et al. · Health Promotion International · 2008 · 177 citations

Adolescent substance use, parental monitoring, and leisure-time activities: 12-year outcomes of primary prevention in Iceland

Álfgeir L. Kristjánsson, Jack E. James, John P. Allegrante et al. · Preventive Medicine · 2010 · 130 citations

Primary Prevention, Substance Use, Adolescent Medicine +14