표 4. | Table 4. 모음연장발성과 관련된 음향 변수의 기술 통계 II(스펙트럼, 켑스트럼) | Descriptive statistics of acoustic variables related to sustained vowel II (spectrum, cepstrum)

var.	Time	Fatigue	Mean	SD	n	var.	Time	Fatigue	Mean	SD	n
CPP	Before	NoYes	27.0627.00	3.964.20	2525	LH-ratio(main)	Before	NoYes	1.9532.049	0.3910.611	2525
	After	NoYes	27.3027.29	3.293.43	2525		After	NoYes	1.8371.832	0.1640.217	2525
CPPs	Before	NoYes	17.9117.49	3.483.41	2525	tilt	Before	NoYes	–4.125–3.943	0.6260.999	2525
	After	NoYes	17.7617.84	2.892.88	2525		After	NoYes	–3.824–4.007	0.8100.754	2525
RNR (pre-emphasized)	Before	NoYes	5.0716.656	3.8804.398	2525	Offset (main)	Before	NoYes	21.6719.12	4.797.22	2525
	After	NoYes	7.3144.835	5.3283.187	2525		After	NoYes	21.7922.38	3.845.43	2525
Skewness (pre-emphasized)	Before	NoYes	14.2213.23	6.6110.09	2525	lowE	Before	NoYes	86.6884.92	2.013.28	2525
	After	NoYes	12.2912.56	5.395.22	2525		After	NoYes	86.2786.39	1.712.42	2525
slope_ltas (main)	Before	NoYes	–41.11–40.81	6.2959.331	2525	highE (main)	Before	NoYes	45.5744.11	6.509.81	2525
	After	NoYes	–38.96–38.62	4.6545.329	2525		After	NoYes	47.3147.78	4.125.70	2525

CPP, cepstral peak prominence; CPPs, smoothed CPP; RNR, rhamonics to noise ratio; LH-ratio, low to high ratio; lowE, low energy; highE, high energy.