Table 1. Characteristics of 638 856 Women Undergoing 1 693 163 Subsequent Digital Screening Mammograms Overall and by Invasive Breast Cancer and DCIS Status Within 1 Year of Follow-up^a .

Characteristic	Screening Mammograms, %
	No Invasive Cancer or DCIS (n = 1 685 648)	Invasive Cancer (n = 5326)b	DCIS (n = 2189)b
Age, y
40-49	26.1	16.4	22.5
50-59	35.6	30.7	32.3
60-69	29.2	38.5	34.7
70-74	9.0	14.4	12.6
Race/ethnicity
White, non-Hispanic	67.0	73.3	66.2
Black, non-Hispanic	7.5	7.1	6.8
Asian, Native Hawaiian, or Pacific Islander	13.7	12.2	18.0
Hispanic	4.8	3.1	3.4
Other, mixed, or unknown	7.1	4.2	5.7
Menopausal status
Premenopausal or perimenopausal	29.8	20.7	26.2
Postmenopausal
Current HT use	7.3	9.9	7.7
No current HT use	53.6	58.1	55.9
Current HT use unknown	6.8	9.2	8.3
Surgical menopausal	2.5	2.1	1.9
Family history of breast cancerc	16.5	25.1	23.0
History of breast biopsy	19.9	37.4	35.9
BI-RADS breast density
Almost entirely fatty	10.9	7.1	5.7
Scattered areas of fibroglandular densities	42.1	41.3	38.6
Heterogeneously dense	38.9	43.4	45.2
Extremely dense	8.1	8.3	10.4
BI-RADS final assessment
Normal (1)	69.1	12.1	4.2
Normal, benign finding (2)	28.2	7.4	2.6
Probably benign (3)	1.7	4.2	5.5
Suspicious (4)	1.0	56.4	83.6
Malignant (5)	0	20.0	4.2
BCSC 5-y riskd
0% to <1.00%, low	29.6	14.1	18.2
1.00%-1.66%, average	40.1	34.8	36.6
1.67%-2.49%, intermediate	20.7	29.0	24.5
2.50%-3.99%, high	8.4	18.2	17.2
≥4.00%, very high	1.2	4.0	3.4

Abbreviations: BCSC, Breast Cancer Surveillance Consortium; BI-RADS, Breast Imaging Reporting and Data System; DCIS, ductal carcinoma in situ; HT, hormone therapy.

^aSubsequent screening examinations after recent prior mammogram within 9 to 30 months.

^bInvasive cancer cases and DCIS within 12 months of screening mammography.

^cDefined as first-degree relative (mother, sister, or daughter) with breast cancer.

^dThe BCSC 5-year risk was calculated using age, race/ethnicity, first-degree family history of breast cancer, history of breast biopsy, and BI-RADS density.