Table I.

Main demographic and clinical characteristics of healthy controls, patients with amnestic mild cognitive impairment (aMCI), and patients with Alzheimer's disease (AD)

	Healthy controls	aMCI patients	AD patients	P *
Number of subjects	11	15	10	–
Men/Women	4/6	5/10	2/8	n.s.
Mean age (range) [years]	65.6 (54–77)	66.8 (41–79)	69.1 (52–84)	n.s.
Median disease duration (range) [years]	–	2.8 (0.5–5.0)	2.9 (1.0–5.0)	n.s.
Median MMSE (range)	28 (27–30)	27 (23–28)	17 (12–25)	<0.001**
Median CDR (range)	0.0 (0.0–0.0)	0.5 (0.5–0.5)	1.0 (1.0–2.0)	<0.001**
Mean maximum finger tapping frequency for 30‐s trial (range)	1.6 (1.4–1.9)	1.6 (1.2–1.9)	1.5 (1.1–1.8)	n.s.

Abbreviations: aMCI = amnestic mild cognitive impairment; AD = Alzheimer's disease; MMSE = Mini Mental State Examination; CDR = Clinical Dementia Rating scale.

^*Analysis of covariance (ANCOVA) between groups. See text for further details.

^**Adjusted for age.