Table 3. Wrist actigraphy and sleep quality data.

	Control	Pre-AD	P value
Actigraphy
Participants	5	7
Sleep Time, hr	6.4 ± 1.3	6.7 ± 1.7	0.99
Efficiency, %	81.2 ± 7.6	85.1 ± 5.6	0.27
Relative Amplitude	0.75 ± 0.2	0.86 ± 0.1	0.34
Intra-daily Variability	0.83 ± 0.3	0.86 ± 0.2	0.76
Interdaily Stability	0.51 ± 0.2	0.59 ± 0.2	0.27
Fragmentation Index	28.6 ±14.3	31.5 ±14.0	0.99
M10	11673 ± 6563	10724 ± 3290	0.88
L5	1410 ± 854	753 ± 587	0.20
Sleep Questionnaires
Participants	8	8
Epworth	5.9 ± 4.1	4.1 ± 4.2	0.37
Berlin Low, Berlin High, %	75, 25	86, 14	0.99
PSQI	6.1 ± 2.1	6.1 ± 3.9	0.80
Quality of sleep from PSQI	3.6 ± 4.9	5.1 ± 6.8	0.73

Mean ± standard deviation.

Statistical significance was set at P value < 0.05.

Pre-AD, pre-symptomatic Alzheimer’s disease. M10, Most 10 Average; L5, Least 5 Average; PSQI, Pittsburgh Sleep Quality Index.