Descriptive statistics for perfusion parameters in DVAs without and with CMs
| Perfusion Parametera | CM | Mean | 95% CI | Median | Minimum | Maximum | P Valueb |
|---|---|---|---|---|---|---|---|
| rCBV | − | 3.32 | 2.45–4.20 | 2.98 | 1.39 | 6.61 | .16 |
| + | 3.17 | 2.01–4.34 | 2.83 | 1.41 | 5.92 | .24 | |
| rCBF | − | 2.28 | 1.85–2.70 | 2.21 | 1.09 | 4.43 | .07 |
| + | 1.82 | 1.20–2.43 | 1.81 | 0.79 | 3.47 | .60 | |
| rMTT | − | 1.29 | 1.19–1.40 | 1.32 | 1.00 | 1.62 | .67 |
| + | 1.70 | 1.46–1.93 | 1.75 | 1.17 | 2.14 | .62 | |
| cCBV | − | 1.01 | 0.99–1.03 | 1.01 | 0.94 | 1.06 | .22 |
| + | 0.98 | 0.95–1.02 | 0.98 | 0.89 | 1.05 | .85 | |
| cCBF | − | 1.02 | 0.98–1.06 | 1.01 | 0.95 | 1.27 | <.01 |
| + | 0.99 | 0.96–1.03 | 0.98 | 0.94 | 1.08 | .33 | |
| cMTT | − | 1.00 | 0.97–1.03 | 1.00 | 0.91 | 1.15 | .35 |
| + | 0.99 | 0.97–1.02 | 0.99 | 0.94 | 1.05 | .99 |
Note:— +, present; −, absent.
↵a rCBV, rCBF, and rMTT represent relative cerebral blood volume, relative cerebral blood flow, and relative mean transit time respectively, as measured in brain tissue around the DVA. cCBV, cCBF, and cMTT represent corresponding control values as measured in brain tissue with normal venous drainage (ipsilateral to the DVA).
↵b P value for Shapiro-Wilk W-test for data distribution normality. A value < .05 indicates a non-normal distribution.