TABLE 1.

Subject demographics

	BT (n = 11)	Placebo (n = 11)	P
Age (y)	38.5 ± 11.2	41.6 ± 10.0	.429
Female:male	10:1	10:1	1.000
Disease duration (y)	10.5 ± 10.0	5.9 ± 3.4	.575
Number of aberrant morae	19.2 ± 1.36	21.3 ± 1.86	.263
(S) in GRBAS	2.1 ± 0.21	1.9 ± 0.34	.366
VHI	78.5 ± 5.69	72.5 ± 5.01	.093
VAS	71.9 ± 3.56	72.9 ± 5.45	.843

Abbreviations: BT, botulinum toxin; VHI, Voice Handicap Index; VAS, visual analogue scale.