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

Table 3

Voice analysis of fiberscopy group following botulinum toxin injection.

	Pre-botox	Post-botox	value
MPT (sec)	11.1 ± 2.7	11.3 ± 1.7	0.691
Jitter (%)	1.73 ± 1.58	1.07 ± 1.11	0.256
Shimmer (%)	4.11 ± 2.69	2.89 ± 1.07	0.177
HNR (dB)	21.98 ± 7.2	23.4 ± 5.2	0.532
(dB)	218.1 ± 38.8	205.5 ± 27.9	0.460
VHI	77.5 ± 24.3	23.4 ± 5.2	0.001*

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.