Table 4.

Spearman Correlation Analyses Between the CDR SOB and the RI and PI for All Participants

	Whole Sample		AD Spectrum
r	p-value	r	p-value
Mean RI right MCA	0.610	0.010	0.389	0.012
Mean RI left MCA	0.350	0.013	0.366	0.018
Mean PI right MCA	0.242	0.061	0.272	0.060
Mean PI left MCA	0.314	0.023	0.331	0.030

Abbreviations: CDR SOB, clinical dementia rating scale sum of boxes; RI, resistance index; PI, pulsatility index; MCA, middle cerebral artery; r, correlation coefficient.