표 6 / Table 6 조음중재 전/후 모음공간 측정치 / Vowel space measures before and after visual phonics intervention

Variables		Mean±SD	Z	p-value
F1/아/	Pre	920.67±49.69	-2.023*	.043
	Post	980.41±36.59
F2/아/	Pre	1,834.19±108.69	-1.753	.080
	Post	1,750.07±124.22
F1/이/	Pre	548.02±41.18	-2.023*	.043
	Post	488.27±21.59
F2/이/	Pre	2,398.20±212.13	-2.023*	.043
	Post	2,592.02±155.41
F1/우/	Pre	490.54±17.29	-.944	.345
	Post	506.20±34.07
F2/우/	Pre	1,401.57±103.96	-2.023*	.043
	Post	1,349.78±72.67
VSA	Pre	206,267.19±98,781.89	-2.023*	.043
	Post	298,890.52±59,780.51
VAI	Pre	3,732.39±200.50	-1.753	.080
	Post	3,613.38±178.12
FCR	Pre	2,440.68±133.71	-2.023*	.043
	Post	2,344.74±76.10
F2ratio	Pre	1.72±.25	-2.023*	.043
	Post	1.92±.18

^* p<.05.
VSA, vowel space area; VAI, vowel articulatory index; FCR, formant centralization ratio; F2ratio, F2i/F2u ratio.