Rate & Detection Rate by Age & Time Since Previous Mammography

	Number of screening mammography examinations¹	Number of cancers²	Cancer rate (per 1,000 examinations)³	Cancer detection rate (per 1,000 examinations)⁴
Age 40-44	493,794	1,131	2.29	1.62
9-15 months	171,162	379	2.21	1.40
16-20 months	57,093	117	2.04	1.40
21-27 months	74,079	159	2.14	1.53
28+ months	113,997	284	2.49	1.85
No previous mammography	77,463	192	2.47	1.98
Age 45-49	584,268	1,938	3.31	2.46
9-15 months	249,606	733	2.93	2.05
16-20 months	81,021	264	3.25	2.33
21-27 months	101,055	341	3.37	2.55
28+ months	126,831	485	3.82	3.01
No previous mammography	25,755	115	4.46	3.84
Age 50-54	632,728	2,525	3.99	3.13
9-15 months	332,137	1,202	3.61	2.66
16-20 months	93,524	341	3.64	2.70
21-27 months	91,507	344	3.75	3.20
28+ months	99,059	545	5.50	4.73
No previous mammography	16,501	93	5.63	5.02
Age 55-59	509,175	2,575	5.05	4.13
9-15 months	293,493	1,293	4.40	3.48
16-20 months	73,181	404	5.52	4.29
21-27 months	68,464	386	5.63	4.68
28+ months	64,803	399	6.15	5.50
No previous mammography	9,234	93	10.07	9.42
Age 60-64	393,587	2,276	5.78	4.62
9-15 months	235,212	1,179	5.01	3.80
16-20 months	53,622	303	5.65	4.55
21-27 months	50,895	335	6.58	5.46
28+ months	46,357	381	8.21	7.22
No previous mammography	7,501	78	10.39	9.33
Age 65-69	339,245	2,094	6.17	5.09
9-15 months	202,009	1,035	5.12	3.99
16-20 months	44,638	278	6.22	5.33
21-27 months	45,714	335	7.32	6.19
28+ months	39,225	342	8.71	7.80
No previous mammography	7,659	104	13.57	12.27
Age 70-74	292,409	2,075	7.09	5.88
9-15 months	172,059	1,048	6.09	4.83
16-20 months	36,867	258	6.99	5.75
21-27 months	43,474	339	7.79	6.87
28+ months	34,479	332	9.62	8.49
No previous mammography	5,530	98	17.72	15.55
Age 75-89	358,626	2,915	8.12	6.87
9-15 months	196,559	1,246	6.33	5.09
16-20 months	44,550	324	7.27	6.03
21-27 months	60,480	578	9.55	8.33
28+ months	49,619	579	11.66	10.37
No previous mammography	7,418	188	25.34	23.59

¹ Screening mammography examination: Mammography examinations indicated by the radiogist to be for screening with bilateral views done and no other mammogram within the past 9 months among women without breast implants or a prior breast cancer diagnosis.

² Cancers = The number of examinations with a tissue diagnosis of ductal carcinoma in situ or invasive cancer within 1 year following the examination and before the next screening mammography examination.

³ Cancer rate (per 1,000 examinations) = The number of cancers among 1,000 screening mammography examinations.

⁴ Cancer detection rate (per 1,000 examinations) = The number of cancers among 1,000 screening mammography examinations with a positive interpretation (BI-RADS category 0, 3 with a recommendation for immediate follow-up, 4, or 5).




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Cancer Rate (per 1,000 examinations) and Cancer Detection Rate (per 1,000 examinations) for 3,603,832 Screening Mammography Examinations from 1996 to 2006 by Age & Time (Months) Since Previous Mammography