표 2. | Table 2. MTD 환자와 정상 성인의 음향학적 특성 | Acoustic measurements in the MTD and the control groups

	Variables	Group	N	Mean±SD	t-value	p-value
Sustained vowel /a/	CPP	MTD	36	10.11±2.24	–3.632	.001^**
	CPP	CG	36	11.56±1.16	–3.632	.001^**
	CPP_F0	MTD	36	199.65±29.82	–3.126	.003^**
	CPP_F0	CG	36	218.12±19.18	–3.126	.003^**
	CSID	MTD	36	12.14±12.91	1.220	.226
	CSID	CG	36	9.15±7.02	1.220	.226
Connected speech	CPP	MTD	36	5.21±1.15	–7.341	.000^***
	CPP	CG	36	6.86±0.71	–7.341	.000^***
	CPP_F0	MTD	36	201.59±19.93	–5.591	.000^***
	CPP_F0	CG	36	224.23±13.88	–5.591	.000^***
	CSID	MTD	36	15.91±19.68	5.512	.000^***
	CSID	CG	36	–3.36±7.22	5.512	.000^***

p<.05,
p<.01,
p<.0001.
MTD, muscle tension dysphonia; CPP, cepstral peak prominence; CG, control group; CSID, cepstral spectral index of dysphonia.