표 3 / Table 3 VFSS 후 WVQ 유무 집단의 독립 표본 t-검정 결과 / Result of independent samples t-test between Wet group and Non-wet group post-VFSS

	Mean±SD		df	p $
	Wet group	Non-wet group
Amount	1.93(±0.77)	1.74(±0.80)	102	0.21
Coating	1.85(±0.75)	1.66(±0.78)	102	0.21
Intensity	65.24(±6.46)	65.28(±8.38)	104	0.98
F0(male)	155.98(±34.48)	153.00(±37.560)	83	0.70
F0(female)	198.04(±35.85)	193.42(±34.03)	19	0.77
F0_SD	19.93(±21.89)	10.77(±11.89)	69.36	0.011*
Jitter	2.16(±1.29)	0.69(±0.35)	52.98	0.000**
RAP	1.19(±0.79)	0.33(±0.19)	51.73	0.000**
Shimmer	13.47(±4.81)	7.96(±3.63)	86.03	0.000**
APQ	10.26(±4.27)	6.61(±3.76)	104	0.000**
HNR	8.25(±4.45)	14.21(±4.10)	104	0.000**
NHR	0.33(±0.19)	0.08(±0.06)	55.56	0.000**
FUF	11.19(±11.31)	2.00(±3.79)	55.77	0.000**
DVB	6.16(±8.55)	0.47(±2.41)	53.22	0.000**
CPP	11.44(±3.36)	15.47(±2.82)	104	0.000**

^$ 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