- 2021. Trends in the utilization of youth primary healthcare services and psychological distress. BMC Health Services Research.
- 2021. Parenting of schoolchildren’s television viewing in Addis Ababa, Ethiopia. Journal of Children and Media. 1-17.
- 2020. POSITIVE YOUTH DEVELOPMENT PERSPECTIVE: THE INTERPLAY BETWEEN THE 5Cs AND ANXIETY. Psychological Applications and Trends. 3-6.
- 2020. ARE THE 5CS RELATED TO RISKY BEHAVIOUR: ANALYSIS ACROSS COUNTRIES . Psychological Applications and Trends. 220-222.
- 2019. Promoting academic achievement within a positive youth development framework. Norsk Epidemiologi. 79-87.
- 2019. Positive Youth Development Across Cultures: Introduction to the Special Issue. Child and Youth Care Forum. 147-153.
- 2019. Participation in Organized Sports and Self-Organized Physical Activity: Associations with Developmental Factors. International Journal of Environmental Research and Public Health (IJERPH). 16 pages.
- 2019. Health complaints among adolescents in Norway: A twenty-year perspective on trends. PLOS ONE. 1-10.
- 2019. Gender and Positive Youth Development: Advancing Sustainable Development Goals in Ghana. Zeitschrift für Psychologie. 134-138.
- 2018. Positive Youth Development and Academic Achievement in Slovenia. Child and Youth Care Forum. 1-18.
- 2018. Factor structure of positive youth development: Contributions of exploratory structural equation modeling. Personality and Individual Differences. 12-15.
- 2018. Developmental Assets and Academic Performance of Adolescents in Ghana, Kenya, and South Africa. Child and Youth Care Forum. 1-16.
- 2018. Developmental Assets Among Young People in Three European Contexts: Italy, Norway and Turkey. Child and Youth Care Forum. 1-20.
- 2017. The Relationships between Family, School and Community Support and Boundaries and Student Engagement among Chinese Adolescents . Current Psychology. 705-714.
- 2017. Temporal trends in adolescents’ self-reported psychosomatic health complaints from 1980-2016: A systematic review and meta-analysis. PLOS ONE.
- 2017. A Life History Approach to Understanding Developmental Assets Among Chinese Adolescents. Child and Youth Care Forum. 1-15.
- 2015. Growth trajectories of health behaviors from adolescence through young adulthood. International Journal of Environmental Research and Public Health (IJERPH). 13711-13729.
- 2014. The association between smoking and depression from adolescence to adulthood. Addiction. 1022-1030.
- 2014. Attentional bias in snus users: An experimental study. PLOS ONE.
- 2013. Decline in sexual risk behaviours among young people in Zambia (2000-2009): Do neighbourhood contextual effects play a role? PLOS ONE. 15 pages.
- 2012. The role of tobacco promoting and restraining factors in smoking intentions among Ghanaian youth. BMC Public Health.
- 2011. Smoking cessation among Norwegian adolescents and young adults: preferred cessation methods. Scandinavian Journal of Psychology. 154-160.
- 2011. Outcome expectations and use of smokeless tobacco (snus): A cross-sectional study among young Norwegian snus users. Scandinavian Journal of Psychology. 64-70.
- 2011. Brief report: Multilevel analysis of school smoking policy and pupil smoking behaviour in Wales. Journal of Adolescence. 385-389.
- 2011. Actions taken by schools when tobacco policies are violated: Associations with adolescent smoking prevalence. Scandinavian Journal of Psychology. 494-501.
- 2010. Perceived support provided by teachers and classmates and students' self-reported academic initiative. Journal of School Psychology. 247-267.
- 2010. Does relative age effect exist among Norwegian Professionnal Soccer Players? International Journal of Applied Sports Sciences. 66-76.
- 2009. Subjective attractiveness and perceived trendiness in smoking and snus use: a study among young Norwegians. Health Education Research. 162-172.
- 2009. Psychological reactance and adolescents' attitudes toward tobacco-control measures. Journal of Applied Social Psychology. 1718-1738.
- 2009. An ecological system approach to adolescent smoking behaviour. Journal of Youth and Adolescence. 1351-1363.
- 2007. Hvilken betydning har personlige og strukturelle faktorer for gjennomføring av mastergrad? UNIPED. 5-14.
- 2006. The relationship between smoker role models and intentions to smoke among adolescents. Journal of Youth and Adolescence. 551-562.
- 2006. Normative processes and adolescents' smoking behaviour in Norway: A multilevel analysis. Social Science and Medicine. 1810-1818.
- 2006. Family and school influences on adolescent smoking behaviour. Health Education. 465-479.
- 2020. Depresjon i ikke-vestlige kulturer: Hvordan takler de det?
- 2013. Depresjon: Symptomer, triggere, forebygging og behandling.
- 2020. Who helps? Relations of contribution to community, family, friends, and school activities with the 5Cs of the positive youth development.
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- 2016. Risk behaviors among young people: the role of social support.
- 2016. Developmental Assets among Young People in the European context.
- 2015. Positive youth development: an empirical study of young people in Ghana and Norway.
- 2014. Smoking among adolescents: an ecological-systems approach.
- 2014. Short- and long-term associations between young people’s and parents' health-enhancing and health-compromising behaviours.
- 2013. Subjective attractiveness and perceived trendiness: Explaining current trends in smoking and snus use.
- 2013. Multiple health behaviours: growth trajectories and covariates.
- 2012. Health behaviours among young Norwegians:developmental trajectories.
- 2012. Depression:symptoms, prevalence, consequences, prevention & treatment.
- 2006. Normative processes and adolescent smoking behaviour: a multilevel analysis.
- 2005. Intrapersonal factors, family and school norms: combined and interactive influence on adolescent smoking behaviour.
- 2013. Measures of outcome expectancies, addiction and the use of snus. Journal of Behavioral Addictions. 35-36.
- 2012. Growth trajectories of health behaviours: Transition from adolescence to adulthood.
- 2012. Declines in Sexual Risk Behaviours among Young People in Zambia (2000 – 2009): Do Neighbourhood Contextual Effects Play a Role?
- 2010. Subjective attractiveness and perceived trendiness in smoking and snus use: a study among young Norwegians.
- 2007. PSYCHOLOGICAL REACTANCE AND ADOLESCENTS’ ATTITUDES TOWARD TOBACCO CONTROL MEASURES.