Benchmarks for Abnormal Diagnostic Mammography

Benchmarks for Abnormal Diagnostic Mammography Interpretations

from 2007 - 2013

by Indication for Exam*


Abnormal Interpretation Rate

  Work-Up of Abnormal Screening Examination Short-Interval Follow-Up Evaluation of Breast Problem / No Lump or Lump Unknown Evaluation of Breast Problem / Palpable Lump All Diagnostic Examinations
Abnormal Interpretation Rate (AIR)‡ 16.90% 5.10% 9.10% 19.00% 12.50%
Readers with 100+ examinations 157 116 98 87 249
Abnormal final interpretations 21,213 2,361 6,320 5,715 49,504
All examinations 125,610 46,639 69,153 30,157 396,263
AIR (Median - 50th percentile) 15.2 4.3 8.6 17.1 11.6
AIR (25th, 75th percentiles) 10.9, 20.2 2.5, 7.1 6.2, 13.0 14.3, 21.3 8.2, 14.8
AIR (10th, 90th percentiles) 8.3, 27.1 1.4, 9.0 3.7, 16.5 8.2, 26.4 5.9, 18.2
Smoothed Plots of Abnormal Interpretation Rates Frequency Distributions by indication for exam*
for 396,263 Diagnostic Mammography Exams (Among Radiologists with 100+ Exams), 2007 - 2013

        

        


Positive Predictive Value 1 (PPV1)

Note - PPV1 was not calculated for this sample due to limited sample size


Positive Predictive Value 2 (PPV2)

  Work-Up of Abnormal Screening Examination Short-Interval Follow-Up Evaluation of Breast Problem / No Lump or Lump Unknown Evaluation of Breast Problem / Palpable Lump All Diagnostic Examinations
PPV2|| 26.70% 18.00% 26.10% 33.70% 27.40%
   Readers with 10+ biopsy recommended 169 73 96 112 251
   Cancers 5,725 387 1,674 2,057 13,580
   Abnormal final interpretations 21,410 2,153 6,409 6,112 49,606
   PPV2 (Median - 50th percentile) 28.6 18.2 28 41.6 31.6
   PPV2 (25th, 75th percentiles) 21.2, 40.3 12.0, 25.0 20.0, 40.0 32.4, 50.0 22.8, 40.3
   PPV2 (10th, 90th percentiles) 16.7, 48.6 7.1, 33.3 15.8, 54.2 21.0, 61.9 17.1, 48.5
Smoothed Plots of PPV2 Frequency Distributions BY INDICATION FOR EXAM*
for 49,606 Diagnostic Mammography Exams with Abnormal Results for Which Biopsy was Recommended (Among Radiologists with 10+ Biopsies Recommended), 2007 - 2013

          

          


Positive Predictive Value 3 (PPV3)

  Work-Up of Abnormal Screening Examination Short-Interval Follow-Up Evaluation of Breast Problem / No Lump or Lump Unknown Evaluation of Breast Problem / Palpable Lump All Diagnostic Examinations
PPV3# 29.00% 21.50% 30.30% 36.30% 30.30%
   Readers with 10+ biopsy performed 162 61 77 98 202
   Cancers 5,526 354 1,548 1,878 10,429
   Abnormal final interpretations, with known biopsy 19,088 1,645 5,117 5,175 34,475
   PPV3 (Median - 50th percentile) 32.6 21.1 31.3 46.9 36.6
   PPV3 (25th, 75th percentiles) 23.5, 44.8 16.2, 30.0 25.0, 43.5 34.8, 58.3 26.1, 46.2
   PPV3 (10th, 90th percentiles) 19.2, 50.0 10.0, 40.0 20.0, 61.7 22.3, 68.8 20.2, 56.1
Smoothed Plots of PPVFrequency Distributions BY INDICATION FOR EXAM*
for 34,475 Diagnostic Mammography Exams with Abnormal Results for Which Biopsy was Recommended and Performed (Among Radiologists with 10+ Biopsies Performed), 2007 - 2013

        

       


Footnotes:
Numbers are frequencies unless otherwise indicated.
The first non-zero assessment within 90 days was used as the final assessment for analysis.
*  Includes examinations for radiologists who interpreted at least 10 cases in a given column; excludes examinations for which the radiologist is unknown.
  The number of radiologists in this column does not equal the sum of radiologists in the other columns. A given radiologist may contribute to each of the preceding columns, but may contribute to this column only once.
  Abnormal interpretation rate = the percentage of examinations with an abnormal final interpretation (BI-RADS category 4 or 5; Note: 0 or 3 with a recommendation for biopsy was recoded as 4).
||  PPV2 = the percentage of examinations with an abnormal final interpretation that result in a tissue diagnosis of cancer within 1 year.
§  PPV3 = the percentage of examinations with an abnormal final interpretation, where it is known that a biopsy was performed as a result of the abnormal diagnostic examination, that result in a tissue diagnosis of cancer within 1 year. (Excludes Chicago)
+  For figures, An overlaid solid line indicates the 50th percentile (median), paired dashed lines indicate the 25th and 75th percentiles, and paired dotted lines indicate the 10th and 90th percentiles. A single dashed line below the median indicates the 10th and 25th percentiles are the same and a single dashed line above the median indicates the 75th and 90th percentiles are the same.
Table & Figures last updated Mar 26, 2017.

The following must be cited when reproducing this data:

"The Breast Cancer Surveillance Consortium and its data collection and sharing activities are funded by grants from the National Cancer Institute (P01CA154292, U54CA163303), Patient-Centered Outcomes Research Institute (PCS-1504-30370), and Agency for Health Research and Quality (R01 HS018366-01A1). Downloaded xx/xx/xxxx from the Breast Cancer Surveillance Consortium Web site - http://www.bcsc-research.org/. More information regarding the BCSC is available at: http://bcsc-research.org/."