Table 3.

Actigraphic assessment

Subjective sleep outcomes	SCD, mean (SD)	±95% CI	Controls, mean (SD)	± 95% CI	F	df	R2	P	Significant predictors
TIB (minutes)	486 (49)	468–503	480 (52)	463–497	2.43	5, 64	0.16	.044	Age
Night-to-night variability	45 (20)	38–53	53 (22)	46–61	2.27	5, 64	0.15	.058	–
TST (minutes)	405 (46)	388–421	418 (49)	402–434	1.07	5, 64	0.08	.383	–
Night-to-night variability*	44 (16)	38–49	49 (19)	42–55	1.72	5, 63	0.12	.143	–
SOL (minutes)*†	9 (6)	7–12	6 (4)	5–7	4.34	5, 63	0.26	.002	Depressive symptoms, apnea risk
Night-to-night variability*†	9 (7)	7–12	6 (5)	4–7	2.76	5, 63	0.18	.026	Depressive symptoms
WASO (minutes)†	69 (26)	60–79	55 (31)	45–66	2.42	5, 64	0.16	.044	SCD
Night-to-night variability	27 (15)	22–33	23 (15)	18–28	1.60	5, 64	0.11	.172	–
N awakenings	16.3 (5.1)	14.5–18.2	15.0 (5.8)	13.1–16.9	1.27	5, 64	0.09	.286	–
Night-to-night variability	4.5 (1.7)	3.8–5.1	4.5 (1.7)	4.0–5.0	0.71	5, 64	0.05	.620	–
Average length of the awakenings (minutes)	4.9 (2.3)	4.1–5.7	3.7 (1.0)	3.4–4.0	2.23	5, 64	0.15	.061	–
Night-to-night variability	2.3 (1.9)	1.6–3.0	1.2 (0.7)	1.0–1.5	2.51	5, 64	0.16	.039	SCD
Awakening index	2.4 (0.7)	2.2–2.7	2.2 (0.9)	1.9–2.5	1.50	5, 64	0.11	.204	–
SE (%)	83 (5)	82–85	87 (6)	86–89	2.73	5, 64	0.18	.027	SCD
Night-to-night variability*	6 (3)	5–7	5 (3)	4–5	1.80	5, 63	0.13	.125	–

Abbreviations: SCD, subjective cognitive decline; SD, standard deviation; CI, confidence interval; TIB, time in bed; TST, total sleep time; SOL, sleep onset latency; WASO, wake after sleep onset; SE, sleep efficiency.

^*One SCD participant has been excluded (value exceeding 3 SD of the mean).

^†Analysis based on log-transformed data.