Tarjei Widding-Havneraas
PhD candidate in Epidemiology, University of Bergen

I am a PhD candidate in Epidemiology at the Department of Clinical Medicine, University of Bergen, Norway and the Competence Centre for Research and Education in Forensic Psychiatry, Haukeland University Hospital. I am also a researcher on the EQOP-project at University of Oslo.

In 2021-2022, I had the privilege of working with Felix Elwert as an honorary fellow at University of Wisconsin-Madison, USA. During my stay we worked on quasi-experimental designs with Norwegian administrative data. 

My PhD has included training in epidemiology and causal inference from London School of Hygiene and Tropical Medicine and University of Essex. I hold an MPhil in Sociology and a BSc in Economics from the University of Bergen. In my spare time, I enjoy basketball, art, and books.

PhD project: Effects of ADHD medication on injury and crime prevention

My PhD examines (i) the use of variation in medical practice patterns as instrumental variables, (ii) the extent to which ADHD symptoms, diagnosis, and medication vary geographically, and (iii) effects of ADHD medication on injuries and crime.

Research interests



Peer-reviewed publications

(8) Ingvild Lyhmann, Tarjei Widding-Havneraas, Henrik Daae Zachrisson, Ingvar Bjelland, Ashmita Chaulagain, Arnstein Mykletun, Anne Halmøy. Variation in attitudes toward diagnosis and medication of ADHD: a survey among clinicians in the Norwegian child and adolescent mental health services. 2022. European Child & Adolescent Psychiatry.

(7) Tarjei Widding-Havneraas & Henrik Daae Zachrisson. A Gentle Introduction to Instrumental Variables. 2022. Journal of Clinical Epidemiology.

(6) Tarjei Widding-Havneraas, Simen Markussen, Felix Elwert, Ingvild Lyhmann, Ingvar Bjelland, Anne Halmøy, Ashmita Chaulagain, Eivind Ystrøm, Arnstein Mykletun, Henrik Daae Zachrisson. Geographical variation in ADHD: do diagnoses reflect symptom levels? 2022. European Child & Adolescent Psychiatry.

(5) Tarjei Widding-Havneraas, Ashmita Chaulagain, Ingvild Lyhmann, Henrik Daae Zachrisson, Felix Elwert, Simen Markussen, David McDaid, Arnstein Mykletun. Preference-based instrumental variables in health research rely on important and underreported assumptions: a systematic review. 2021. Journal of Clinical Epidemiology.

(4) Arnstein Mykletun, Tarjei Widding-Havneraas, Ashmita Chaulagain, Ingvild Lyhmann, Ingvar Bjelland, Anne Halmøy, Felix Elwert, Peter Butterworth, Simen Markussen, Henrik Daae Zachrisson, Knut Rypdal. Causal modeling of variation in clinical practice and long-term outcomes of ADHD using Norwegian registry data: the ADHD controversy project. 2021. BMJ Open.

(3) Tarjei Widding-Havneraas & Siri Hansen Pedersen. The role of welfare regimes in the relationship between childhood economic stress and adult health: a multilevel study of 20 European countries. 2020. SSM - Population Health. 

(2) Beate Brinchmann, Tarjei Widding-Havneraas, Matthew Modini, Miles Rinaldi, Cathrine F. Moe, A-La Park, Eoin Killackey, Samuel B. Harvey, Arnstein Mykletun. A meta-regression of the impact of policy on the efficacy of Individual Placement and Support. 2019. Acta Scandinavica Psychiatrica.

(1) Tarjei Widding-Havneraas. Young adults not in employment, education or training: a register-based study, 1993–2009. 2016. Norwegian Journal of Working Life Studies. 

Papers in progress

Other publications