Table 4.

Women's use of breast MRI by breast cancer risk and number

	Women undergoing breast MRI	Women undergoing breast MRI	By Clinical Indicationa
			Screening		Diagnostic		Staging/Treatment		Surveillance
	no. women	Col %	no. women	Col %	no. women	Col %	no. women	Col %	no. women	Col %
Total	10518	100	3049	100	5330	100	2113	100	2116	100
Breast Cancer Riskb
Personal history	3167	30	0	0	1077	20.2	2113	100	2086	98.5
Genetic Mutation	372	3.5	180	6	107	2.0	66	3.1	108	5.1
Family History	5439	52	2501	82	2283	43	863	41	905	43
Number of MRIsc
Only one breast MRI	6810	65	1687	55	3204	61	1143	54	688	33
More than one breast MRI	3708	35	NA		NA		NA		NA
More than one breast MRI for same indication	2937	28	846	28	1120	21	403	19	941	44

MRI = Magnetic resonance imaging; Col = Column; NA = not applicable

^aSum across clinical indications is greater than total as women may have multiple MRIs, each with a different clinical indication.

^bRisk categories defined by presence of diagnostic or procedure code in HPHC claims data at least 45 days prior to the breast MRI for personal history of breast cancer and in the year prior or subsequent to breast MRI for the remaining. For staging/treatment breast MRI, no restriction on timing was used in defining personal history of breast cancer. Categories are not mutually exclusive. Personal history of breast cancer defined by presence of at least one ICD-9 codes: 174, 233.0, V10.3; Deleterious genetic mutation for breast cancer defined by ICD-9 code: V84.01; and family history of breast cancer defined by ICD-9 code: V16.3.

^cCategories are not mutually exclusive.