Muscle Activity in Pre-Treatment and Post-Treatment Oral Submucous Fibrosis Patients: Electromyography Study

Table 3

Left side masseter muscle duration before and after treatment.

Groups	Before		After		Mean difference	% of mean change	t value	value
	Mean	SD	Mean	SD
Group A	7.40	0.45	7.36	0.39	0.04	0.54	0.876	0.386
Group B	7.44	0.51	7.40	0.44	0.04	0.54	1.564	0.125
Group C	7.50	0.64	7.43	0.55	0.07	0.93	1.833	0.074
Group D	5.17	0.14	5.12	0.21	0.05	0.97	1.306	0.198
Control	7.25	0.29	7.21	0.26	0.04	0.55	1.137	0.262
F value	232.132	290.935	—
value

, Group A (mouth opening more than 35 mm), Group B (mouth opening between 30 and 35 mm), Group C (mouth opening between 20 and 30 mm), and Group D (mouth opening less than 20 mm).