Table 4.

Resistance indices by age, sex, race, in key vessel segments

	Resistance Index (Mean and Standard Error)
	BA	VA		MCA		ACA		PCA
	(N=292)	Left (N=301)	Right (N=298)	Left (N=268)	Right (N=270)	Left (N=255)	Right (N=257)	Left (N=256)	Right (N=254)
Age Group
70–74	0.72(0.01)	0.69 (0.01)	0.70 (0.01)	0.75 (0.01)	0.76 (0.01)	0.77 (0.01)	0.79 (0.01)	0.76 (0.01)	0.77 (0.01)
75–79	0.71(0.01)	0.70 (0.01)	0.72 (0.01)	0.76 (0.01)	0.77 (0.01)	0.79 (0.01)	0.79 (0.01)	0.76 (0.01)	0.78 (0.01)
80–84	0.73(0.01)	0.71 (0.01)	0.71 (0.11)	0.76 (0.01)	0.77 (0.01)	0.78 (0.01)	0.79 (0.01)	0.77 (0.01)	0.78 (0.01)
85+	0.72(0.01)	0.69 (0.01)	0.71 (0.01)	0.78 (0.01)	0.78 (0.01)	0.80 (0.01)	0.80 (0.01)	0.78 (0.01)	0.78 (0.01)
Pearson Correlation (p-value) *	0.02 (0.65)	0.070 (0.22)	0.007 (0.91)	0.17 (0.01)	0.070 (0.25)	0.10 (0.10)	0.078 (0.21)	0.10 (0.10)	0.096 (0.13)
Adjusted p-value†	0.50	0.32	0.80	0.007	0.42	0.18	0.31	0.10	0.19
Sex
Men	0.72 (0.01)	0.69 (0.01)	0.70 (0.01)	0.74 (0.01)	0.75 (0.01)	0.76 (0.01)	0.78 (0.01)	0.76 (0.01)	0.77 (0.01)
Women	0.72 (0.01)	0.70 (0.01)	0.72 (0.01)	0.78 (0.01)	0.78 (0.01)	0.80 (0.01)	0.80 (0.01)	0.78 (0.01)	0.78 (0.01)
t-test p-value	0.57	0.64	0.06	0.001	0.01	0.001	0.10	0.06	0.07
Adjusted p-value†	0.27	0.37	0.03	0.006	0.06	0.0004	0.16	0.15	0.08
Race
White	0.72 (0.01)	0.69 (0.01)	0.70 (0.01)	0.76 (0.01)	0.76 (0.01)	0.78 (0.01)	0.79 (0.01)	0.76 (0.01)	0.77 (0.01)
Black	0.73 (0.01)	0.70 (0.01)	0.73 (0.01)	0.77 (0.01)	0.79 (0.01)	0.79 (0.01)	0.80 (0.01)	0.78 (0.01)	0.78 (0.01)
t-test p-value	0.25	0.68	0.002	0.33	0.04	0.45	0.14	0.12	0.35
Adjusted p-value†	0.41	0.94	0.03	0.81	0.16	0.93	0.27	0.23	0.71

^*Pearson correlation coefficients for age as a continuous value (in years) with mean blood flow velocity

^†P-values from linear regression models that included age (years), sex, race-ethnicity (black/white), history of MI or revascularization, hypertension, and history of diabetes.