Table 2.

Comparison of Mean (SD) PEM Values for REMBD Patients and Controls

PEM Variable	REMBD (n = 11)	Controls (n = 31)	t	P	d
Mentalis, REM	0.201 (0.118)	0.035 (0.042)	4.13	0.0028	2.50
Mentalis, NREM	0.053 (0.047)	0.017 (0.015)	2.50	0.0300	1.37
Left Brachioradialis, REM	0.256 (0.091)	0.004 (0.005)	6.15	0.0035	3.90
Left Brachioradialis, NREM	0.065 (0.029)	0.005 (0.007)	4.92	0.0031	2.78
Right Brachioradialis, REM	0.254 (0.076)	0.005 (0.002)	7.29	0.0019	4.61
Right Brachioradialis, NREM	0.082 (0.044)	0.003 (0.003)	4.35	0.0072	2.41
Left Anterior Tibialis, REM	0.195 (0.189)	0.033 (0.063)	2.53	0.0337	1.55
Left Anterior Tibialis, NREM	0.134 (0.164)	0.011 (0.009)	2.47	0.0331	1.49
Right Anterior Tibialis, REM	0.207 (0.208)	0.019 (0.020)	2.70	0.0268	2.00
Right Anterior Tibialis, NREM	0.162 (0.180)	0.012 (0.013)	2.77	0.0199	1.66

REM, rapid eye movement sleep; NREM, non-rapid eye movement sleep

Values shown represent mean and standard deviations of the percentage of 2.5-sec intervals containing phasic muscle activity. A particular 2.5-sec interval could contain several detectable phasic events; however, that interval would receive only a single score indicating the presence of PEM within than interval.

N's vary for some variables because channels were missing

t-test values adjusted for unequal variances using Satterthwaite correction

Effect sizes (d) computed as described by Cohen⁸