Table 1. Performance Measures and Definitions Included in the Basic Clinical Relevant Mammography Audit of the American College of Radiology.

Performance Measure	Definition
Recall rate	Percentage of screening examinations recommended for additional imaging (BI-RADS category 0)
Abnormal interpretation rate	Percentage of screening examinations interpreted as positive (BI-RADS categories 0, 4, and 5)
Recommendation for biopsy or surgical consultation	Number of recommendations for biopsy or surgical consultation (BI-RADS categories 4 and 5)
Known false-negatives	Diagnosis of cancer within 1 year of a negative mammogram (BI-RADS categories 1 or 2 for screening examination; BI-RADS categories 1, 2, or 3 for diagnostic examination)
Sensitivity	Probability of detecting a cancer when a cancer exists (true-positive examinations / all examinations with cancer detected within 1 year)
Specificity	Probability of interpreting an examination as negative when a cancer does not exist (true-negative examinations / all examinations without cancer detected in 1 year)
PPV1	Percentage of all positive screening examinations that result in a cancer diagnosis within 1 year
PPV2	Percentage of all screening or diagnostic examinations recommended for biopsy or surgical consultation that result in a cancer diagnosis within 1 year
PPV3	Percentage of all biopsies done after a positive screening or diagnostic examination that result in a cancer diagnosis within 1 year
Cancer detection rate	Number of cancers correctly detected per 1,000 screening mammograms
Minimal cancers	Percentage of all cancers that are invasive and ≤ 1 cm, or ductal carcinoma in situ
Node-negative cancers	Percentage of all invasive cancers that are node negative

Note—PPV = positive predictive value.