Table 4.

Unadjusted Multivariable Models for Imaging Availability Associated with Facility Vulnerability Indices

Facility Vulnerability Indices	Ultrasound RR (95% CI)	MRI RR (95% CI)	Ultrasound Guided Biopsy RR (95% CI)	MR Guided Biopsy RR (95% CI)	Stereotactic Guided Biopsy RR (95% CI)
Education: at least 15.8% of adults educated below high school graduation	0.99 (0.75, 1.33)	0.86 (0.49, 1.50)	1.13 (0.82, 1.54)	1.40 (0.77, 2.53)	0.95 (0.55, 1.64)
Race/ethnicity: at least 34.5% self-reporting minority status	1.03 (0.82, 1.28)	1.36 (0.70, 2.62)	1.28 (0.88, 1.85)	2.27 (1.19, 4.32)	1.51 (0.99, 2.32)
Rurality: at least 68.1% rural residents	1.40 (1.07, 1.82)	0.33 (0.11, 1.00)	1.45 (0.93, 2.25)	0.46 (0.15, 1.46)	0.93 (0.47, 1.86)
Income: Average census-based median income below $52,517	1.31 (1.06, 1.60)	0.68 (0.37, 1.27)	1.35 (0.94, 1.94)	0.81 (0.39, 1.67)	1.04 (0.59, 1.84)
At least one vulnerability indicator	1.38 (1.09, 1.74)	0.71 (0.42, 1.19)	1.67 (1.30, 2.14)	1.07 (0.61, 1.90)	1.18 (0.75, 1.85)

Note: Relative risk estimates were obtained from unadjusted log binomial GEE models clustering on practice (within site). Confidence intervals (CIs) are based on robust sandwich estimator standard errors.