Table 2.
Mean Blood Flow Velocities by age, sex, race, in key vessel segments
| Mean Blood Flow Velocity (cm/second) (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 | 24.6 (0.8) | 20.7 (0.6) | 20.9 (0.6) | 33.8 (0.9) | 34.8 (0.9) | 32.2 (1.0) | 32.9 (1.1) | 29.8 (0.6) | 29.0 (0.6) |
| 75–79 | 22.7 (0.8) | 19.4 (0.6) | 21.0 (0.6) | 33.9 (1.0) | 33.6 (0.7) | 29.4 (1.0) | 32.3 (1.0) | 28.3 (0.6) | 27.7 (0.6) |
| 80–84 | 22.8 (0.8) | 20.9 (0.7) | 20.2 (0.7) | 32.9 (1.0) | 32.0 (1.0) | 30.1 (1.1) | 29.9 (1.1) | 26.9 (0.6) | 27.4 (0.8) |
| 85+ | 21.0 (0.8) | 19.0 (0.6) | 19.9 (0.7) | 32.2 (1.1) | 32.8 (1.1) | 31.0 (1.1) | 31.4 (1.0) | 27.6 (0.6) | 26.7 (0.6) |
| Pearson Correlation (p-value) * Adjusted p-value† |
−0.21 (0.0003) 0.001 |
−0.079 (0.17) 0.26 |
−0.10 (0.08) 0.07 |
−0.076 (0.20) 0.26 |
−0.11 (0.07) 0.40 |
−0.059 (.35) 0.45 |
−0.12 (0.06) 0.05 |
−0.19 (0.003) 0.02 |
−0.18 (0.004) 0.003 |
| Sex | |||||||||
| Men | 22.0 (0.7) | 20.3 (0.5) | 20.5 (0.6) | 33.9 (0.9) | 34.6 (0.7) | 30.9 (0.9) | 32.9 (0.9) | 28.7 (0.5) | 28.6 (0.6) |
| Women | 23.3 (0.5) | 19.8 (0.4) | 20.5 (0.4) | 32.8 (0.6) | 32.5 (0.6) | 30.6 (0.7) | 30.9 (0.6) | 27.9 (0.4) | 27.2 (0.4) |
| t-test p-value | 0.14 | 0.46 | 0.96 | 0.31 | 0.02 | 0.76 | 0.06 | 0.28 | 0.05 |
| Adjusted p-value† | 0.04 | 0.59 | 0.78 | 0.67 | 0.10 | 0.76 | 0.11 | 0.91 | 0.18 |
| Race | |||||||||
| White | 22.1 (0.5) | 19.3 (0.4) | 20.2 (0.4) | 33.5 (0.6) | 33.3 (0.6) | 31.5 (0.7) | 32.0 (0.7) | 28.5 (0.4) | 28.0 (0.4) |
| Black | 23.8 (0.7) | 21.1 (0.6) | 21.1 (0.5) | 32.2 (0.9) | 32.6 (0.9) | 29.6 (1.0) | 31.8 (1.0) | 27.2 (0.6) | 26.7 (0.6) |
| t-test p-value | 0.05 | 0.02 | 0.18 | 0.22 | 0.48 | 0.10 | 0.91 | 0.07 | 0.09 |
| Adjusted p-value† | 0.24 | 0.02 | 0.31 | 0.19 | 0.59 | 0.09 | 0.92 | 0.07 | 0.09 |
*
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.