Table 2.

Spearman’s correlation coefficients between objective sleep parameters (sleep-EEG data) and age, EDSS, BMI, sleep complaints, daytime sleepiness, symptoms of restless legs syndrome (RLS) and sleep-disordered breathing (SDB), depressive symptoms, fatigue, and self-reported physical activity levels.

					Dimensions							Statistics
	Age	EDSS	BMI	ISI	ESS	RLS	SDB	BDI-FS	Fatigue	PA Moderate	PA Vigorous	M (SD)
Total sleep time (min)	−0.07	−0.03	0.13	0.19	−0.25	−0.30	0.10	−0.26	−0.03	0.49	0.01	417.44 (62.68)
Sleep efficiency (%)	0.16	0.52 *	−0.05	−0.51 *	−0.43	−0.35	−0.17	0.13	0.28	0.01	0.34	81.06 (9.67)
Sleep onset latency (min)	0.02	−0.25	−0.02	0.40	0.44	0.49	0.17	−0.11	0.22	−0.30	−0.26	15.51 (10.40)
WASO time (min)	0.14	0.33	−0.12	0.14	0.16	0.09	0.12	0.28	−0.19	−0.27	0.18	42.24 (4.03)
REM sleep time (min)	0.30	−0.17	0.16	−0.13	−0.13	−0.14	0.19	0.10	−0.09	0.20	−0.43	23.07 (4.02)
REM (%)	0.29	0.33	0.23	0.40	0.41	−0.42	−0.00	0.39	−0.07	0.27	0.04	5.13 (0.99)
Light sleep duration (min)	−0.27	−0.12	−0.21	−0.02	0.37	0.05	−0.04	0.42	−0.14	0.40	0.24	276.13 (45.50)
Light sleep percentage (%)	−0.32	−0.12	−0.09	0.07	−0.35	−0.03	−0.06	−0.38	−0.23	0.51 *	−0.16	58.00 (5.65)
Deep sleep duration (min)	0.32	−0.16	−0.07	−0.28	0.18	0.07	0.22	0.02	0.03	0.56 *	0.25	87.97 (23.26)
Deep sleep percentage (%)	0.43	0.16	−0.02	−0.04	−0.43	0.05	0.05	0.23	0.07	−0.71 **	−0.03	19.43 (4.86)

Notes: EDSS = Expanded Disability Status Scale; BMI = Body Mass Index; BDI-FS = Beck Depression Inventory; Fast Screen; ISI = Insomnia Severity Index; ESS = Epworth Sleepiness Scale; RLS = Restless Legs Syndrome; SDB = Sleep-disordered breathing; PA = physical activity. REM = rapid eye movement; WASO = wakening after sleep onset. * = p < 0.05; ** = p < 0.01. Always Spearman’s rho correlation coefficients.