From Brown U: Screening Mammography Recall Rate: Does Practice Site Matter?

http://www.ncbi.nlm.nih.gov/pubmed/23884734

Radiology. 2013 Jul 24. [Epub ahead of print]

Screening Mammography Recall Rate: Does Practice Site Matter?

Rothschild J, Lourenco AP, Mainiero MB.

Source

Department of Diagnostic Imaging, Alpert Medical School of Brown University, Rhode Island Hospital, 593 Eddy St, 3rd Floor Main Bldg, Providence, RI 02903.

Abstract

Purpose:To determine whether the screening mammography recall rate for individual radiologists varies as a function of imaging site.

Materials and Methods:Institutional review board-approved, HIPAA-compliant retrospective review of mammography audit data was performed between May 1, 2008, and September 1, 2011, for five radiologists with expertise in breast imaging interpreting mammograms at a community office practice and an academic referral hospital. Informed consent was waived. Both sites used full-field digital mammography and batch screening interpretation. Recall rates were calculated from audit data. Breast density, history of surgery or biopsy, and availability of prior mammograms were compared in a sample of 500 mammograms from each site by using χ² and two-sample t tests.

Results:Radiologists interpreted a total of 74 297 screening mammograms between both sites during the study. The overall mean recall rate was 7.8% ± 0.2 (standard deviation). Overall recall rate at the community site was significantly lower than at the hospital site (6.9% ± 0.3 vs 8.6% ± 0.3, P < .001). Recall rates for each radiologist were also lower at the community site: 3.7% versus 6.5% (P < .001), 9.6% versus 12.0% (P < .001), 7.5% versus 9.1% (P = .01), 7.6% versus 11.5% (P < .001), and 5.6% versus 8.0% (P = .02). There was a significantly higher proportion of patients at the hospital site with a history of surgery (13.4% vs 5.6%, P < .001) and biopsy (7.0% vs 1.4%, P < .001) but no difference in the percentage with dense breasts or in the percentage with availability of prior mammograms. Mean patient age was lower at the hospital site: 56.1 versus 62.9 years (P < .001).

Conclusion:Recall rates were higher at the hospital site, probably primarily caused by patient population factors.