Table 3.

Results of trapezius thickness from ultrasonography before and after treatment with incobotulinum toxin A

Time of evaluation of incobotulinum toxin A				Mean difference (95% CI)	P value
Time	Mean ± SD	Time	Mean ± SD
Baseline	9.63 ± 1.58
		60 days	7.33 ± 1.21	2.30 (1.76 to 2.85)	<0.001
		12 months	8.89 ± 1.52	0.74 (0.52 to 0.96)	<0.001
60 days	7.33 ± 1.21
		Baseline	9.63 ± 1.58
		12 months	8.89 ± 1.52	−1.56 (−2.07 to −1.06)	<0.001