Overdiagnosis, sojourn time, and sensitivity in the Copenhagen mammography screening program.

Research output: Contribution to journalJournal articleResearchpeer-review

  • Anne Helene Olsen
  • Olorunsola F Agbaje
  • Jonathan P Myles
  • Lynge, Elsebeth
  • Stephen W Duffy
The goal of this research was to estimate the overdiagnosis at the first and second screens of the mammography screening program in Copenhagen, Denmark. This study involves a mammography service screening program in Copenhagen, Denmark, with 35,123 women screened at least once. We fit multistate models to the screening data, including preclinical incidence of progressive cancers and nonprogressive (i.e., overdiagnosed) cancers. We estimated mean sojourn time as 2.7 years (95% confidence interval [CI] 2.2-3.1) and screening test sensitivity as 100% (95% CI 99.8-100). Overdiagnosis was estimated to be 7.8% (95% CI 0.3-26.5) at the first screen and 0.5% (95% CI 0.02-2.1) at the second screen. This corresponds to 4.8% of all cancers diagnosed among participants during the first two invitation rounds and following intervals. A modest overdiagnosis was estimated for the Copenhagen screening program, deriving almost exclusively from the first screen. The CIs were very broad, however, and estimates from larger datasets are warranted.
Original languageEnglish
JournalBreast Journal
Issue number4
Pages (from-to)338-42
Number of pages4
Publication statusPublished - 2006

Bibliographical note

Keywords: Aged; Breast Neoplasms; Denmark; Disease Progression; Female; Humans; Mammography; Mass Screening; Middle Aged; Models, Theoretical; Sensitivity and Specificity

ID: 8592169