표 5 / Table 5 VFSS 전 WVQ 유무 집단의 독립 표본 t-검정 결과 / Result of independent samples t-test between WVQ groups pre-VFSS

	Mean(±SD)				df	p $
	Wet group		Non-wet group
Intensity	64.21	(±6.56)	61.54	(±7.18)	104	0.05*
F0(male)	158.06	(±52.90)	152.24	(±39.66)	83	0.56
F0(female)	195.71	(±38.18)	204.71	(±47.39)	19	0.66
F0_SD	12.59	(±13.62)	10.58	(±12.03)	104	0.42
Jitter	1.63	(±1.28)	0.94	(±0.77)	73.73	0.001**
RAP	0.88	(±0.76)	0.48	(±0.44)	74.87	0.001**
Shimmer	11.02	(±5.42)	8.76	(±4.50)	104	0.021*
APQ	7.84	(±4.37)	7.59	(±6.00)	102	0.81
HNR	10.88	(±5.79)	12.92	(±4.83)	104	0.051
NHR	0.22	(±0.18)	0.13	(±0.16)	104	0.007**
FUF	6.21	(±10.68)	2.65	(±4.99)	63.83	0.026*
DVB	2.98	(±5.42)	0.92	(±2.94)	69.33	0.014*
CPP	12.91	(±3.61)	14.41	(±3.04)	104	0.023*

^$ Independent Samples t-test
^* p<0.05, ^** p<0.01
VFSS, videofluoroscopic swallowing study; F0, fundamental frequency; SD, standard deviation; RAP, relative average perturbation; APQ, amplitude perturbation quotient; HNR, Harmonics-to-noise ratio; NHR, Noise-to-harmonics ratio; FUF, fraction of locally unvoiced frames; DVB, degree of voiced breaks; CPP, cepstral prominence peak