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

Table 2

Comparison of static 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.

	F1 mean			F1 SD			F2 mean			F2 SD			F3 mean			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	844	103		66.6	73.1		1393	127		87.8	82.3		2762	481		240.6	250.4
Polyp	763	134	0	99.4	72.3	0	1380	154	0.639	99.8	64.8	0.001	2894	326	0.128	237.6	229.0	0.139
Unilateral VCP	791	200	0.148	117.9	90.8	0	1436	169	0.027	113.3	105.3	0.003	2994	376	0	194.7	195.2	0.804