. 2014 Jan 13;43(3):20130016. doi: 10.1259/dmfr.20130016

Table 4.

Comparison of the mean ± standard deviation (SD) of the cross-sectional thickness of the masseter, anterior temporalis and orbicularis oris muscles in the relaxed and contracted state (right and left side) in all four study groups and the control group (Student's unpaired t-test)

Groups	Side		Masseter		Anterior temporalis		Orbicularis oris
Groups	Side		Mean ± SD	p-value	Mean ± SD	p-value	Mean ± SD	p-value
Group I^a	Right	Relaxed	10.19 ± 1.23	0.000, HS, p < 0.0001	5.63 ± 1.34	0.08, NS, p > 0.05	3.73 ± 0.75	0.003, S, p < 0.0500
	Right	Contracted	14.85 ± 2.84	0.000, HS, p < 0.0001	6.89 ± 1.73	0.08, NS, p > 0.05	5.31 ± 1.25	0.003, S, p < 0.0500
	Left	Relaxed	10.50 ± 1.82	0.000, HS, p < 0.0001	6.15 ± 1.87	0.17, NS, p > 0.05	4.14 ± 0.54	0.000, HS, p < 0.0001
	Left	Contracted	14.05 ± 2.69	0.000, HS, p < 0.0001	7.52 ± 2.39	0.17, NS, p > 0.05	5.45 ± 0.67	0.000, HS, p < 0.0001
Group II^a	Right	Relaxed	10.48 ± 1.79	0.014, S, p < 0.0500	5.19 ± 1.35	0.09, NS, p > 0.05	5.19 ± 1.35	0.20, NS, p > 0.0500
	Right	Contracted	13.27 ± 2.14	0.014, S, p < 0.0500	6.73 ± 2.41	0.09, NS, p > 0.05	6.73 ± 2.41	0.20, NS, p > 0.0500
	Left	Relaxed	9.23 ± 0.74	0.000, HS, p < 0.0001	5.34 ± 1.28	0.11, NS, p > 0.05	5.34 ± 1.28	0.05, NS, p > 0.0500
	Left	Contracted	12.81 ± 1.54	0.000, HS, p < 0.0001	6.26 ± 1.16	0.11, NS, p > 0.05	6.26 ± 1.16	0.05, NS, p > 0.0500
Group III^a	Right	Relaxed	10.18 ± 1.48	0.000, HS, p < 0.0001	6.05 ± 1.16	0.05, NS, p > 0.05	6.05 ± 1.16	0.01, S, p < 0.0500
	Right	Contracted	14.18 ± 1.61	0.000, HS, p < 0.0001	7.30 ± 1.52	0.05, NS, p > 0.05	7.30 ± 1.52	0.01, S, p < 0.0500
	Left	Relaxed	10.62 ± 0.86	0.000, HS, p < 0.0001	5.38 ± 1.10	0.05, NS, p > 0.05	5.38 ± 1.10	0.000, HS, p < 0.0001
	Left	Contracted	13.87 ± 1.69	0.000, HS, p < 0.0001	6.67 ± 1.62	0.05, NS, p > 0.05	6.67 ± 1.62	0.000, HS, p < 0.0001
Group IV^a	Right	Relaxed	9.11 ± 1.14	0.000, HS, p < 0.0001	5.51 ± 1.04	0.01, S, p < 0.05	5.51 ± 1.04	0.01, S, p < 0.0500
	Right	Contracted	11.59 ± 1.96	0.000, HS, p < 0.0001	6.69 ± 0.82	0.01, S, p < 0.05	6.69 ± 0.82	0.01, S, p < 0.0500
	Left	Relaxed	9.14 ± 1.35	0.000, HS, p < 0.0001	5.38 ± 0.55	0.001, S, p < 0.05	5.38 ± 0.55	0.001, S, p < 0.0500
	Left	Contracted	11.39 ± 1.86	0.000, HS, p < 0.0001	6.34 ± 0.74	0.001, S, p < 0.05	6.34 ± 0.74	0.001, S, p < 0.0500
Control^b	Right	Relaxed	10.54 ± 2.11	0.000, HS, p < 0.0001	5.11 ± 0.85	0.06, NS, p > 0.05	5.11 ± 0.85	0.000, HS, p < 0.0001
	Right	Contracted	14.23 ± 2.67	0.000, HS, p < 0.0001	5.78 ± 1.32	0.06, NS, p > 0.05	5.78 ± 1.32	0.000, HS, p < 0.0001
	Left	Relaxed	10.33 ± 1.67	0.000, HS, p < 0.0001	6.89 ± 1.18	0.99, NS, p > 0.05	6.89 ± 1.18	0.001, S, p < 0.0500
	Left	Contracted	14.65 ± 1.71	0.000, HS, p < 0.0001	6.89 ± 1.20	0.99, NS, p > 0.05	6.60 ± 1.74	0.001, S, p < 0.0500

HS, highly significant; NS, not significant; S, significant.

n = 10.

n = 20.