An Investigation of Vocal Tract Characteristics for Acoustic Discrimination of Pathological Voices

Table 4

Comparison of dynamic features between the first three formants of the vowel /aa/ in normal, polyp, and unilateral VCP subjects for females. The term SD indicates standard deviation.

	Delta F1 mean			Delta F1 SD			Delta F2 mean			Delta F2 SD			Delta F3 mean			Delta F3 SD
	Mean	SD	𝑃 value	Mean	SD	𝑃 value	Mean	SD	𝑃 value	Mean	SD	𝑃 value	Mean	SD	𝑃 value	Mean	SD	𝑃 value
Normal	−0.03	1.15		18.5	22.5		−0.03	1.15		18.5	22.5		−0.03	1.15		18.5	22.5
Polyp	−0.16	0.66	0.627	28.3	22.8	0	−0.16	0.66	0.627	28.3	22.8	0	−0.16	0.66	0.627	28.3	22.8	0
Unilateral; VCP	−0.28	0.91	0.761	32.7	26.0	0	−0.28	0.91	0.761	32.7	26.0	0	−0.28	0.91	0.761	32.7	26.0	0