Per-Henrik Zahl

Author information from the last article

Per-Henrik Zahl er lege og statistiker ved Folkehelseinstituttet. Han har veiledet stipendiater i suicidologi.

Articles by Per-Henrik Zahl

Statistical analysis of early cancer diagnosis requires new methods

Per-Henrik Zahl

17.06.2024: The methods for diagnosing cancer have traditionally been based on the concept that everything grows. However, immunotherapy and screening trials show that some tumours resolve spontaneously. The traditional understanding of cancer, which forms the basis for diagnosis, treatment and statistical...

Norwegian mammography screening – numerous self-contradictions in the evaluation

Per-Henrik Zahl,
Øyvind Holme,
Magnus Løberg

25.10.2016: Public mammography screening was introduced in Norway in 1996. The goal was to reduce mortality from breast cancer by 30 per cent. In 2006, the Research Council of Norway was charged with evaluating the Mammography Programme. The report contains a number of self-contradictions: screening does not...

Overdiagnosis of breast cancer after 14 years of mammography screening

Per-Henrik Zahl,
Jan Mæhlen

21.02.2012: The incidence of breast cancer in Norway has increased in the past 50 years (1). The increase has been particularly pronounced since 1995, and in this period has largely affected the group aged 50 – 69. Organised mammography screening for the age group 50 – 69 commenced in 1996 in Akershus, Oslo...