Table 3. Comparison of preintervention and postintervention data of the auditory-perceptual analysis (GRBAS scale) in 17 IGHD subjects.

Variables	n	Preintervention		Post-intervention		p
		n	%	n	%
General Grade of vocal deviation	0	0	0	9	52.9	0.0001
	1	0	0	8	47.1
	2	10	58.8	0	0
	3	7	41.2	0	0
Roughness	0	0	0	13	76.5	0.0001
	1	4	23.5	4	23.5
	2	8	47.1	0	0
	3	5	29.4	0	0
Breathiness	0	1	5.9	17	100.0	0.0001
	1	7	41.2	0	0
	2	8	47.1	0	0
	3	1	5.9	0	0
Asthenia	0	10	58.8	17	100.0	0.015
	1	4	23.5	0	0
	2	3	17.6	0	0
	3	0	0	0	0
Strain	0	0	0	11	64.7	0.0001
	1	2	11.8	6	35.3
	2	10	58.8	0	0
	3	5	29.4	0	0

0 = normal, 1 = mild deviation, 2 = moderate deviation, 3 = severe deviation, using the Wilcoxon test.