Rate & Detection Rate Age & Time Since Previous Mammography

	Number of diagnostic mammography examinations¹	Number of cancers²	Cancer rate (per 1,000 examinations)³	Cancer detection rate (per 1,000 examinations)⁴
Age 40-44	44,818	1,092	24.36	19.25
<=15 months	22,098	442	20.00	14.16
16-20 months	4,445	79	17.77	12.82
21-27 months	4,242	108	25.45	20.50
28+ months	8,158	196	24.02	20.59
No previous mammography	5,875	267	45.44	40.51
Age 45-49	48,121	1,523	31.64	25.22
<=15 months	27,720	716	25.82	18.61
16-20 months	5,131	124	24.16	18.90
21-27 months	4,842	143	29.53	23.54
28+ months	7,990	346	43.30	38.04
No previous mammography	2,438	194	79.57	75.06
Age 50-54	42,142	1,484	35.21	27.43
<=15 months	28,477	833	29.25	21.21
16-20 months	4,272	138	32.30	26.68
21-27 months	3,318	116	34.96	27.12
28+ months	4,902	279	56.91	48.75
No previous mammography	1,173	118	100.59	92.92
Age 55-59	32,087	1,281	39.92	32.25
<=15 months	23,118	737	31.87	24.09
16-20 months	3,021	106	35.08	29.12
21-27 months	2,194	101	46.03	39.19
28+ months	3,056	212	69.37	61.51
No previous mammography	698	125	179.08	166.18
Age 60-64	24,714	1,069	43.25	33.90
<=15 months	18,303	650	35.51	25.73
16-20 months	2,226	79	35.48	30.99
21-27 months	1,556	63	40.48	32.77
28+ months	2,024	164	81.02	71.14
No previous mammography	605	113	186.77	170.24
Age 65-69	21,104	1,028	48.71	38.94
<=15 months	15,834	605	38.20	28.29
16-20 months	1,715	61	35.56	28.57
21-27 months	1,299	81	62.35	52.34
28+ months	1,694	167	98.58	88.54
No previous mammography	562	114	202.84	190.39
Age 70-74	18,157	1,001	55.13	46.31
<=15 months	13,483	534	39.60	30.48
16-20 months	1,516	66	43.53	36.93
21-27 months	1,132	66	58.30	55.65
28+ months	1,476	186	126.01	114.49
No previous mammography	550	149	270.90	258.18
Age 75-89	24,537	1,786	72.78	62.27
<=15 months	16,647	738	44.33	34.06
16-20 months	2,206	126	57.11	46.69
21-27 months	1,765	132	74.78	69.68
28+ months	2,774	442	159.33	148.88
No previous mammography	1,145	348	303.93	281.22

¹ Diagnostic mammography examination: Mammography examinations indicated by the radiologist to be for evaluation of a breast problem.

² Cancers = The number of examinations with a tissue diagnosis of ductal carcinoma in situ or invasive cancer within 30 days prior to or 1 year following the examination.

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

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




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Cancer Rate (per 1,000 examinations) and Cancer Detection Rate (per 1,000 examinations) for 255,680 Diagnostic Mammography Examinations from 1996 to 2005 by Age & Time (Months) Since Previous Mammography