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dc.contributor.authorThy, Jonas Evensen
dc.contributor.authorLarsen, Marthe
dc.contributor.authorVigeland, Einar
dc.contributor.authorKoch, Henrik Wethe
dc.contributor.authorHovda, Tone
dc.contributor.authorHofvind, Solveig Sand-Hanssen
dc.date.accessioned2024-02-19T10:18:52Z
dc.date.available2024-02-19T10:18:52Z
dc.date.issued2023-09-11
dc.description.abstractIrregular attendance in breast cancer screening has been associated with higher breast cancer mortality compared to regular attendance. Early performance measures of a screening program following regular versus irregular screening attendance have been less studied. We aimed to investigate early performance measures following regular versus irregular screening attendance. Methods We used information from 3,302,396 screening examinations from the Cancer Registry of Norway. Examinations were classified as regular or irregular. Regular was defined as an examination 2 years ± 6 months after the prior examination, and irregular examination >2 years and 6 months after prior examination. Performance measures included recall, biopsy, screen-detected and interval cancer, positive predictive values, and histopathological tumor characteristics. Results Recall rate was 2.4% (72,429/3,070,068) for regular and 3.5% (8217/232,328) for irregular examinations. The biopsy rate was 1.0% (29,197/3,070,068) for regular and 1.7% (3825/232,328) for irregular examinations, while the rate of screen-detected cancers 0.51% (15,664/3,070,068) versus 0.86% (2003/232,328), respectively. The adjusted odds ratio was 1.53 (95% CI: 1.49–1.56) for recall, 1.73 (95% CI: 1.68–1.80) for biopsy, and 1.68 (95% CI: 1.60–1.76) for screen-detected cancer after irregular examinations compared to regular examinations. The proportion of lymph node-positive tumors was 20.1% (2553/12,719) for regular and 25.6% (426/1662) for irregular examinations. Conclusion Irregular attendance was linked to higher rates of recall, needle biopsies, and cancer detection. Cancers detected after irregular examinations had less favorable histopathological tumor characteristics compared to cancers detected after regular examinations. Women should be encouraged to attend screening when invited to avoid delays in diagnosis.en_US
dc.identifier.citationThy JE, Larsen M, Vigeland E, Koch HW, Hovda T, Hofvind S. Early performance measures following regular versus irregular screening attendance in the population-based screening program for breast cancer in Norway. Journal of Medical Screening. 2023en_US
dc.identifier.cristinIDFRIDAID 2174592
dc.identifier.doi10.1177/09691413231199583
dc.identifier.issn0969-1413
dc.identifier.issn1475-5793
dc.identifier.urihttps://hdl.handle.net/10037/32974
dc.language.isoengen_US
dc.publisherSAGE Publicationsen_US
dc.relation.journalJournal of Medical Screening
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2023 The Author(s)en_US
dc.titleEarly performance measures following regular versus irregular screening attendance in the population-based screening program for breast cancer in Norwayen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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