Treatment Efficacy of Electromyography versus Fiberscopy-Guided Botulinum Toxin Injection in Adductor Spasmodic Dysphonia Patients: A Prospective Comparative Study

Table 2

Voice analysis of EMG group following botulinum toxin injection.

	Pre-botox	Post-botox	value
MPT (sec)	12.11 ± 1.78	12.14 ± 1.90	0.776
Jitter (%)	1.66 ± 1.15	1.21 ± 0.45	0.233
Shimmer (%)	4.63 ± 2.10	3.40 ± 1.29	0.140
HNR (dB)	21.89 ± 3.95	23.35 ± 6.36	0.300
(dB)	209.2 ± 28.9	193.65 ± 20.9	0.173
VHI	81.9 ± 19.7	23.3 ± 6.3	0.002*

Pre-botox: before botulinum toxin injection.
Post-botox: after botulinum toxin injection.
*Significantly improved after botulinum toxin injection. Analyzed by Wilcoxon signed-rank test.
MPT: maximum phonation time.
HNR: harmonics-to-noise ratio.
(dB): fundamental frequency (decibel).
VHI: voice handicap index-30.