Table 3.

Global relative power and median frequency

	AD	MCI-stable	HC	p value
Delta (1–4 Hz)	0.27 (0.17–0.34)	0.28 (0.23–0.29)	0.27 (0.19–0.32)	n.s.
Theta (4–8 Hz)	0.24 (0.18–0.29)	0.18 (0.14–0.21)	0.15 (0.13–0.21)	<0.01*
Alpha1 (8–10 Hz)	0.18 (0.11–0.32)	0.17 (0.16–0.29)	0.21 (0.12–0.31)	n.s.
Alpha2 (10–13 Hz)	0.09 (0.07–0.13)	0.14 (0.12–0.15)	0.12 (0.09–0.15)	n.s.
Beta (13–30 Hz)	0.16 (0.13–0.22)	0.2 (0.18–0.23)	0.21 (0.17–0.26)	0.03
Median frequency	8.35 (8.17–8.92)	8.99 (8.88–9.26)	8.96 (8.54–9.29)	<0.01*

AD patients with Alzheimer’s disease, MCI-stable patients with stable or improving cognition over 30 months, HC healthy controls, n.s. not significant

Data presented are median (interquartile range)

*p < 0.05 by t test for AD vs. MCI-stable, representing statistically significant result