Table 2.

Characteristics of Patients and Radiologists at Mammography Facilities, According to Use or Nonuse of Computer-Aided Detection (CAD).^*

Characteristic	CAD Never Implemented	CAD Implemented
		Before Implementation	After Implementation
Patients †
Age (yr)	57.8±12.1	55.1±10.9	55.4±11.1
High breast density (%)‡	49.3	41.5	44.2
Mammography within previous 9–20 mo (%)	49.1	71.8	76.7
Radiologists §
Experience performing mammography (%)
<10yr	16.6	29.9	26.8
10–19 yr	57.0	54.2	53.2
≥20 yr	26.4	15.9	20.0
No. of mammograms interpreted in previous year (%)
≤1000	11.9	8.0	7.9
1001–2000	30.1	45.1	40.9
>2000	58.0	46.9	51.2

^*Plus–minus values are means ±SD. All characteristics differed significantly (P<0.001) across categories of CAD implementation.

^†Characteristics of patients are provided for 429,345 mammograms (398,159 performed without CAD and 31,186 performed with CAD).

^‡High density was defined as either heterogeneously or extremely dense.

^§These characteristics are provided for 332,869 mammograms interpreted (308,099 without CAD and 24,770 with CAD) by radiologists who responded to a mailed survey and gave informed consent for linkage to mammographic data.