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. 2019 Oct 29;9:15510. doi: 10.1038/s41598-019-52029-4

Table 2.

Correlation coefficients of white matter hyperintensity volume with continuous variables.

WMH volume (mL) Total P Subcortical P Periventricular P
Age (year) 0.453 0.026* 0.075 0.726 0.463 0.023*
Body mass index (kg/m2) −0.137 0.524 −0.116 0.591 −0.114 0.594
Systolic blood pressure (mmHg) 0.029 0.894 0.093 0.666 −0.221 0.300
Diastolic blood pressure (mmHg) −0.020 0.927 0.015 0.944 −0.173 0.418
Mean blood pressure (mmHg) 0.019 0.931 0.061 0.776 −0.223 0.296
Epworth sleepiness score −0.085 0.693 −0.020 0.926 0.001 0.997
Waking MFV −0.161 0.453 0.117 0.588 −0.067 0.757
Waking PI 0.277 0.191 0.036 0.867 0.312 0.138
MFV (Sleep/Waking Ratio) 0.035 0.872 0.128 0.512 −0.020 0.928
PI (Sleep/Waking Ratio) −0.088 0.682 −0.185 0.386 0.130 0.546
MFV variation (Sleep/Waking Ratio) −0.434 0.034* −0.499 0.013* 0.083 0.698
VLF relative power (Sleep/Waking Ratio) −0.037 0.865 −0.219 0.303 0.031 0.886
LF relative power (Sleep/Waking Ratio) −0.242 0.255 0.241 0.256 0.178 0.407
HF relative power (Sleep/Waking Ratio) 0.237 0.265 0.006 0.977 −0.076 0.725
Sleep/waking ratio of the VLF peak −0.349 0.094 −0.406 0.049* −0.111 0.613

MFV, mean flow velocity, PI, pulsatility index, VLF, very low frequency bend, LF, low frequency bend, HF, high frequency bend, and WMH white matter hyperintensity. *P < 0.05, **P < 0.01.