Contribution and performance of mobile units in an organized mammography screening program
- PMID: 23823881
- PMCID: PMC6974043
- DOI: 10.17269/cjph.104.3810
Contribution and performance of mobile units in an organized mammography screening program
Abstract
Background: The aims of this study were to evaluate the contribution of mobile mammography units to participation rate and to compare their performance to fixed screening centres within the organized mammography screening program of Quebec, Canada.
Methods: The study is based on all screening mammograms carried out in women aged 50-69 who participated in the Québec program from 2002 to 2010. Performance was measured by screening sensitivity, false-positive rate (1-specificity), positive likelihood ratio as well as abnormal call rate, detection rate, interval cancer rate, positive predictive value, and tumour characteristics. Poisson regression models with robust variance estimation were used to take into account the multi-level structure of the data. All models were adjusted for characteristics related to women.
Results: During the 2002-2010 period, 2,292,592 screening mammograms were performed, of which 42,279 (1.8%) were in mobile units. In regions serviced exclusively by mobile units, the participation rate reached an average of 63.4% during the 2006-2010 period compared to 54.7% for the entire study population. Estimated sensitivity was similar to that of fixed sites (rate ratio = 0.98 [0.84-1.15]) while the false-positive rate was lower (rate ratio = 0.76 [0.57-1.02]) although this difference was of marginal statistical significance (p=0.07).
Conclusions: In this program, mobile mammography units allowed regions lacking a fixed centre to attain participation rates slightly higher than those in the rest of Quebec, without loss of sensitivity and with some gain in the false-positive rate.
Contexte: Les objectifs de cette étude sont d’évaluer la contribution des unités mobiles en mammographie du Programme québécois de dépistage du cancer du sein sur le taux de participation du programme ainsi que de comparer leur performance à celle des centres fixes.
Méthodes: L’étude est basée sur toutes les mammographies de dépistage réalisées chez des femmes de 50 à 69 ans pour la période 2002 à 2010. La performance des unités mobiles est évaluée à partir de la sensibilité, du taux de faux positif (1-spécificité), du ratio de vraisemblance, du taux de référence pour anomalie, du taux de détection, du taux de cancer d’intervalle, de la valeur prédictive positive et des caractéristiques des cancers. Un modèle de régression de Poisson avec estimation robuste de la variance a été utilisé afin de prendre en compte la structure multiniveaux des données. Les modèles sont ajustés pour les caractéristiques des femmes.
Résultats: Pour la période 2002 à 2010, 2 292 592 mammographies de dépistage ont été réalisées, dont 42 279 (1,8 %) en unités mobiles. Dans les régions desservies uniquement par les unités mobiles, le taux de participation atteint une moyenne de 63,4 % pour la période 2006 à 2010 comparativement à 54,7 % pour l’ensemble de la cohorte à l’étude. La sensibilité était similaire à celle des centres fixes (rapport de risque = 0,98 [0,84–1,15]) tandis que le taux de faux positif était plus faible (rapport de risque = 0,76 [0,57–1,02]), quoique presque statistiquement significatif (p=0,07).
Conclusions: Dans ce programme, les unités mobiles de mammographie permettent aux régions dépourvues de centres fixes d’atteindre un taux de participation légèrement plus élevé que dans le reste du Québec, et ce avec une sensibilité équivalente et un certain gain dans le taux de faux positifs.
Keywords: Breast neoplasms; mammography; mass screening; mobile health units; mobile mammography.
Similar articles
-
Radiologist interpretive volume and breast cancer screening accuracy in a Canadian organized screening program.J Natl Cancer Inst. 2014 Mar;106(3):djt461. doi: 10.1093/jnci/djt461. Epub 2014 Mar 5. J Natl Cancer Inst. 2014. PMID: 24598715
-
Mammography Clinical Image Quality and the False Positive Rate in a Canadian Breast Cancer Screening Program.Can Assoc Radiol J. 2018 May;69(2):169-175. doi: 10.1016/j.carj.2017.12.003. Can Assoc Radiol J. 2018. PMID: 29706254
-
Image Quality and Performance Benchmarks in Vehicle and Hospital Mammography.Clin Breast Cancer. 2020 Jun;20(3):e358-e365. doi: 10.1016/j.clbc.2019.12.003. Epub 2020 Feb 22. Clin Breast Cancer. 2020. PMID: 32171703
-
Digital Breast Tomosynthesis with Hologic 3D Mammography Selenia Dimensions System for Use in Breast Cancer Screening: A Single Technology Assessment [Internet].Oslo, Norway: Knowledge Centre for the Health Services at The Norwegian Institute of Public Health (NIPH); 2017 Sep 4. Report from the Norwegian Institute of Public Health No. 2017-08. Oslo, Norway: Knowledge Centre for the Health Services at The Norwegian Institute of Public Health (NIPH); 2017 Sep 4. Report from the Norwegian Institute of Public Health No. 2017-08. PMID: 29553669 Free Books & Documents. Review.
-
Systematic review: the long-term effects of false-positive mammograms.Ann Intern Med. 2007 Apr 3;146(7):502-10. doi: 10.7326/0003-4819-146-7-200704030-00006. Ann Intern Med. 2007. PMID: 17404352 Review.
Cited by
-
Delays in Follow-up Care for Abnormal Mammograms in Mobile Mammography Versus Fixed-Clinic Patients.J Gen Intern Med. 2022 May;37(7):1619-1625. doi: 10.1007/s11606-021-07189-3. Epub 2022 Feb 25. J Gen Intern Med. 2022. PMID: 35212876 Free PMC article.
-
Enhancing access to cervical and colorectal cancer screening for women in rural and remote northern Alberta: a pilot study.CMAJ Open. 2017 Oct 3;5(4):E740-E745. doi: 10.9778/cmajo.20170055. CMAJ Open. 2017. PMID: 28974533 Free PMC article.
-
Mammograms on-the-go-predictors of repeat visits to mobile mammography vans in St Louis, Missouri, USA: a case-control study.BMJ Open. 2015 Mar 20;5(3):e006960. doi: 10.1136/bmjopen-2014-006960. BMJ Open. 2015. PMID: 25795693 Free PMC article.
References
-
- Gotzsche PC, Nielsen M. Screening for breast cancer with mammography. Cochrane Database Syst Rev. 2006;4:CD001877. - PubMed
-
- Ministère de la santé et des services sociaux. Programme Québécois de Dépistage du Cancer du Sein (PQDCS). Cadre de référence. 1996.
-
- Donabedian A. Aspects of Medical Care Administration: Specifying Requirements for Health Care. Cambridge, UK: Harvard University Press for the Commonwealth Fund; 1973.
-
- Legler J, Meissner HI, Coyne C, Breen N, Chollette V, Rimer BK. The effectiveness of interventions to promote mammography among women with historically lower rates of screening. Cancer Epidemiol Biomarkers Prev. 2002;11(1):59–71. - PubMed
Publication types
MeSH terms
LinkOut - more resources
Full Text Sources
Medical
Miscellaneous
