- 2017. Doping and Public Health. 68 pages. ISBN: 000-00-000-0000-0.
- 2018. Acneiform lesions in a female performance and image-enhancing drug user: The first African case report. African Journal of Drug and Alcohol Studies. 16: 33-36.
- 2018. Comment on the global gaming industry's statement on ICD-11 gaming disorder: a corporate strategy to disregard harm and deflect social responsibility? Addiction. 113: 2145-2146. doi: 10.1111/add.14388
- 2018. Are Video Games a Gateway to Gambling? A Longitudinal Study Based on a Representative Norwegian Sample. Journal of Gambling Studies. 13 pages. doi: 10.1007/s10899-018-9781-z
- 2018. Androgen abuse epidemiology. Current Opinion in Endocrinology, Diabetes & Obesity. 25: 185-194. doi: 10.1097/med.0000000000000403
- 2018. The global prevalence and correlates of skin bleaching: A meta-analysis and meta-regression analysis. International Journal of Dermatology. 58: 24-44. doi: 10.1111/ijd.14052
- 2018. Does individual gambling behavior vary across gambling venues with differing numbers of terminals? An empirical real-world study using player account data. Frontiers in Psychology. 9. doi: 10.3389/fpsyg.2018.00158
- 2018. Mental health symptoms and gambling behaviour: A longitudinal study from adolescence to emerging adulthood. Journal of Behavioral Addictions.
- 2017. Gambling behavior in alcohol-serving and non-alcohol-serving-venues: a study of electronic gaming machine players using account records. Addiction Research and Theory. 25: 201-207. doi: 10.1080/16066359.2017.1288806
- 2017. People around you – Do they matter? An experimental gambling study. International Gambling Studies. 17: 349-365. doi: 10.1080/14459795.2017.1333130
- 2017. Negative wins do not reinforce ‘short-term’ slot machine gambling intensity, game evaluation, and gambling beliefs. International Journal of Mental Health and Addiction. Published ahead of print: 1-11. doi: 10.1007/s11469-017-9761-z
- 2017. The effects of alcohol expectancy and intake on slot machine gambling behavior. Journal of Behavioral Addictions. 6: 203-211. doi: 10.1556/2006.6.2017.031
- 2017. Prevalence and correlates of tattooing in Norway: A large-scale cross-sectional study. Scandinavian Journal of Psychology. 58: 562-570. doi: 10.1111/sjop.12399
- 2017. The relationships between mental health symptoms and gambling behavior in the transition from adolescence to emerging adulthood. Frontiers in Psychology. 8: 1-11. doi: 10.3389/fpsyg.2017.00478
- 2017. Perceived source of anabolic-androgenic steroids and the construal of users' personality. Journal of Substance Use. 22: 587-591. doi: 10.1080/14659891.2016.1271038
- 2016. An empirical real-world study of losses disguised as wins in electronic gaming machines. International Gambling Studies. 16: 470-480. doi: 10.1080/14459795.2016.1232433
- 2016. Doping prevention through anti-doping education and practical strength training: The Hercules program. Performance Enhancement & Health. 5: 24-30. doi: 10.1016/j.peh.2016.01.001
- 2016. Perceived anabolic–androgenic steroid use is associated with perceived neuroticism. Journal of Substance Use. 21: 263-267. doi: 10.3109/14659891.2015.1009510
- 2016. Aggression is associated with increased anabolic–androgenic steroid use contemplation among adolescents. Substance Use & Misuse. 51: 1462-1469. doi: 10.1080/10826084.2016.1186696
- 2015. Prevalence and correlates of anabolic-androgenic steroid use in a nationally representative sample of 17-year-old Norwegian adolescents. Substance Use & Misuse. 50: 139-147. doi: 10.3109/10826084.2014.958859
- 2015. Polypharmacy among anabolic-androgenic steroid users: A descriptive metasynthesis. Substance Abuse Treatment, Prevention, and Policy. 10:12. doi: 10.1186/s13011-015-0006-5
- 2015. Anabolic androgenic steroid use in the Nordic countries : a reply to Bilgrei and Sandøy. Nordic Studies on Alcohol and Drugs. 32: 27-30.
- 2015. Anabolic-androgenic steroid use in the Nordic countries: A meta-analysis and meta-regression analysis. Nordic Studies on Alcohol and Drugs. 32: 7-20. doi: 10.2478/nsad-2014-0037
- 2015. Attitudes towards use of anabolic-androgenic steroids among Ghanaian high school students. International journal of drug policy. 26: 169-174. doi: 10.1016/j.drugpo.2014.10.004
- 2014. Anabolic steroid use is not just about bodybuilding. The Conversation. Published 2014-07-14.
- 2014. Anabolic steroids a global public health problem amid boom in cosmetic use. The Conversation. Published 2014-03-13.
- 2014. The aetiology and trajectory of anabolic-androgenic steroid use initiation: A systematic review and synthesis of qualitative research. Substance Abuse Treatment, Prevention, and Policy. 9. doi: 10.1186/1747-597X-9-27
- 2014. The global epidemiology of anabolic-androgenic steroid use: a meta-analysis and meta-regression analysis. Annals of Epidemiology. 24: 383-398. doi: 10.1016/j.annepidem.2014.01.009
- 2012. Precincts and Prospects in the Use of Focus Groups in Social and Behavioral Science Research. Qualitative Report. 17.
Reports and theses
- 2015. Nonmedical anabolic-androgenic steroid use: Prevalence, attitudes, and social perception. Universitetet i Bergen.
- 2012. Ghanaian youth's drug use: The role of stressful life events and perceived social support. Norwegian University of Science and Technology (NTNU). 124 pages.
- 2010. Perceived stress, self-esteem, and perceived social support as determinants of adolescents' psychosocial health. University of Ghana. 105 pages.
- 2014. Methods used in a meta-analysis and meta-regression analysis of the global epidemiology of anabolic-androgenic steroid use. Methodology. In:
- 2014. SAGE Research Methods Cases. Sage Publications. ISBN: 9781446273050.