Fatigue, Tiredness, Lack of Energy, and Sleepiness in Multiple Sclerosis Patients Referred for Clinical Polysomnography

Table 2

Spearman correlation test results for University of Michigan Sleepiness Impact Assessment responses and polysomnographic parameters in MS patients (top) and matched controls (bottom). Values listed as Spearman coefficient (𝑃 value).

MS patients
	Fatigue	Tiredness	Lack of energy	Sleepiness	Sleep efficiency	Epworth sleepiness; scale
Fatigue	1.0	0.77 (<0.0001)	0.56 (<0.0001)	0.33 (0.076)	−0.55 (0.002)	0.36 (0.073)
Tiredness		1.0	0.42 (0.020)	0.50 (0.005)	−0.40 (0.029)	0.370 (0.063)
Lack of energy			1.0	0.25 (0.180)	−0.36 (0.048)	0.29 (0.147)
Sleepiness				1.0	−0.13 (0.507)	0.24 (0.245)
Matched controls
Fatigue	1.0	0.38 (0.0838)	0.47 (0.028)	0.45 (0.034)	−0.05 (0.833)	0.22 (0.350)
Tiredness		1.0	0.24 (0.204)	0.17 (0.375)	0.29; (0.121)	0.05 (0.802)
Lack of energy			1.0	0.20 (0.309)	−0.17 (0.389)	0.11 (0.580)
Sleepiness				1.0	0.30; (0.116)	0.22 (0.282)