. Author manuscript; available in PMC: 2016 Jul 1.

Published in final edited form as: Acad Radiol. 2015 Apr 4;22(7):846–852. doi: 10.1016/j.acra.2015.02.011

Table 2.

Availability of Advanced Breast Imaging by Breast Cancer Surveillance Consortium Facility Characteristic

		Any Ultrasound	Screening Ultrasound	Any MRI	Screening MRI
Number of facilities providing non- missing data on use of this technology		104	104	103	103
Facility Characteristics	N
Profit / Not for profit status
For profit	23	20 (87.0%; 55.5, 97.3)	4 (17.4%; 8.5, 32.3)	11 (47.8%; 29.2, 67.0)	5 (21.7%; 7.5, 48.9)
Not for profit	61	47 (77.0%; 59.1, 88.6)	14 (23.0%; 15.8, 32.0)	24 (40.0%; 24.0, 58.4)	15 (25.0%; 8.9, 53.2)
Unknown	20	16 (80.0%; 49.9, 94.1)	6 (30.0%; 15.0, 51.0)	9 (45.0%; 25.0, 66.7)	6 (30.0%; 13.8, 53.4)
P value^*		0.25	0.47	0.63	0.87
Academic medical center status
Yes	8	6 (75.0%; 31.7, 95.1)	3 (37.5%;14.1, 68.6)	6 (75.0%; 31.6, 95.1)	4 (50.0%; 19.8, 80.2)
No	96	77 (80.2%; 62.5, 90.8)	21 (21.9%; 16.0, 29.1)	38 (40%; 29.2, 51.9)	22 (23.2%; 13.6, 36.7)
P value		0.79	0.27	0.13	0.064
Facility type
Multi-specialty breast center	25	25/25 (100%)	9 (36.0%; 19.9, 56.0)	19 (76.0%; 45.9, 92.2)	14 (56%; 24.8, 83.1)
Full diagnostic radiology practice	66	54 (81.8%; 65.6, 91.4)	15 (22.7%; 15.7, 31.6)	25 (39.1%; 26.3, 53.5)	12 (18.8%; 9.9, 32.6)
Breast imaging only	4	2 (50.0%; 12.1, 87.9)	0/4 (0%)	0/4 (0%)	0/4 (0%)
Non-radiology practice	9	2 (22.2%; 10.6, 40.7)	0/9 (0%)	0/10 (0%)	0/10 (0%)
P value^†		<0.0001	0.19	0.024	0.020

Results shown here are the number of facilities which reported providing the imaging service in question (columns) within each category of the facility characteristic (row). Percentages are based on observed frequencies divided by the denominators shown in the column marked “N”, except for the following columns:

Denominator is 60 for “not for profit” facilities offering any ultrasound and screening ultrasound
Denominator is 95 for non-academic medical centers offering any ultrasound and screening ultrasound
Denominator is 66 for full diagnostic radiology practices offering any ultrasound and screening ultrasound

The 95% confidence intervals are derived via delta method from post-estimation predicted probability estimates obtained from unadjusted GEE models of the outcome regressed on the corresponding facility characteristic. Models accommodate the non-independence of facilities belonging to the same practice.

All p values are from joint Wald tests of parameters estimated by GEE modeling for each descriptive variable.

P-values shown for profit status were obtained from models restricted to facilities with non-missing profit status information.

^†

P-values shown for facility type were obtained from models restricted to multi-specialty breast centers and full diagnostic radiology practices, except in the case of the provision of any ultrasound, for which modeling was restricted to full diagnostic, breast imaging only, and non-radiology practices.