Table 1 Presenting summary of the results of bioelectrical activity (rest and clenching) of the studied muscles.

Mandibular condition	Muscle	Eyes open		Eyes closed		Statistics
Mandibular condition	Muscle	M (µV)	SD (µV)	M	SD	Test	Test result	P value
Rest	TA-R	2.22	1.60	1.94	1.37	z	1.62	0.11
	TA-L	2.55	1.55	2.30	1.50	z	1.95	0.05* ES = 0.28
	TA mean	2.38	1.40	2.12	1.18	z	2.12	0.03* ES = 0.30
	MM-R	2.56	1.53	2.51	1.39	z	0.54	0.59
	MM-L	2.68	1.56	2.62	1.80	z	0.61	0.54
	MM- mean	2.62	1.34	2.56	1.37	z	0.43	0.67
	SCM-R	1.32	0.49	1.24	0.46	z	1.43	0.15
	SCM-L	1.42	0.49	1.39	0.51	z	1.16	0.25
	SCM-mean	1.37	0.43	1.31	0.41	z	1.17	0.24
	DA-R	1.84	0.71	1.77	0.66	z	0.55	0.58
	DA-L	1.81	0.74	1.72	0.70	z	0.48	0.63
	DA-mean	1.83	0.68	1.74	0.64	z	0.71	0.48
Clenching	TA-R	126.05	69.62	113.44	64.67	z	4.63	< 0.001* ES = 0.65**
	TA-L	130.17	78.15	121.82	75.46	z	3.48	< 0.001* ES = 0.49**
	TA-mean	128.11	71.83	117.63	67.06	z	3.95	< 0.001* ES = 0.55**
	MM-R	142.80	108.04	123.44	97.11	z	4.58	< 0.001* ES = 0.66**
	MM-L	138.90	103.25	124.57	96.74	z	3.37	< 0.001* ES = 0.48**
	MM-mean	140.85	103.46	124.01	94.79	z	4.25	< 0.001* ES = 0.61**
	SCM-R	10.79	9.47	9.04	7.84	z	4.48	< 0.001* ES = 0.64**
	SCM-L	10.26	8.92	8.41	6.48	z	3.94	< 0.001* ES = 0.56**
	SCM-mean	10.53	8.93	8.72	6.97	z	4.40	< 0.001* ES = 0.62**
	DA-R	20.47	15.97	17.61	12.30	z	3.17	< 0.001* ES = 0.47**
	DA-L	22.61	22.98	17.55	15.92	z	3.79	< 0.001* ES = 0.56**
	DA-mean	21.54	17.90	17.58	13.67	z	3.76	< 0.001* ES = 0.55**

Significant values are in bold.
TA the front part of the temporalis muscle, MM the superficial part of the masseter muscle, SCM the middle part of the sternocleidomastoid muscle, DA the anterior belly of the digastric muscle, R right site, L left site.
Significant difference: *p ≤ 0.05, **p ≤ 0.01, ***p ≤ 0.001.

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