Table 6.

(a) A comparison of the electromyographic amplitude (μV) of the masseter, anterior temporalis and orbicularis oris muscles in the contracted state (right and left side) in all four study groups and the control group (Student's paired t-test)

Group		Side	Masseter		Anterior temporalis		Orbicularis oris
			Mean	p-value	Mean	p-value	Mean	p-value
Amplitude	I	Right	391.56	0.27, NS, p > 0.05	407.50	0.32, NS, p > 0.05	383.89	0.92, NS, p > 0.05
		Left	364.26		377.43		379.40
	II	Right	437.73	0.39, NS, p > 0.05	389.13	0.33, NS, p > 0.05	362.83	0.99, NS, p > 0.05
		Left	414.29		364.03		362.46
	III	Right	382.63	0.19, NS, p > 0.05	367.53	0.55, NS, p > 0.05	328.03	0.76, NS, p > 0.05
		Left	411.80		389.46		333.73
	IV	Right	407.66	0.01, S, p < 0.05	407.53	1.00, NS, p > 0.05	407.53	1.00, NS, p > 0.05
		Left	358.69		407.53		407.53
	Control	Right	401.16	0.30, NS, p > 0.05	414.76	0.75, NS, p > 0.05	386.91	0.84, NS, p > 0.05
		Left	428.86		423.51		383.88

NS, not significant; S, significant.