Electromyographic Activity in the EEG in Alzheimer's Disease: Noise or Signal?

Table 1

Clinical characteristics.

	Controls	MCI	AD
male/ female^a	3/10	6/7	6/5
age (years)	73 (5)	73 (5)	75 (8)
education (years)	10 (3)	11 (4)	10 (4)
CAMCOG (max 106)	96 (4)	85 (6)**	68 (10)^**##
Picture memory score (max 30)	25 (2)	15 (3)**	10 (4)^**##
GDS (max 15)^b	0.8 (1.2)	2.1 (1.7)	1.8 (1.6)
NPI “mood/apathy” (max 12)	—	2.0 (1.2)	2.4 (2.7)
NPI “hyperactivity” (max 15)	—	2.0 (1.9)	2.8 (1.9)
NPI “psychosis”; (max 6)	—	0 (0)	0.8 (1.3)

Values in the table are means with S.D. in parentheses. ANOVA was used to assess group differences, except for: ^aχ ²-test was used and ^bNonparametric two sample Kolmogorov-Smirnov tests were used. In view of the small number of MCI and AD patients for whom an NPI was available, we did not assess group differences. **differs from controls (𝑃<.01); ^##differs from MCI patients (𝑃<.01). CAMCOG: Cambridge Cognitive Examination; GDS: Geriatric Depression Scale (N: 13 controls, 12 MCI and 9 AD); NPI: Neuropsychiatric Inventory (N: 5 MCI and 5 AD).