Table 3.

Change of the mean DMFT and SiC indices of Korea 2000-2012 by age

Age		2000			2006			2012a			Reduction rateb, %		Reduction ratec, %
		DMFT	SiC	SiC/DMFT	DMFT	SiC	SiC/DMFT	DMFT	SiC	SiC/DMFT	DMFT	SiC	DMFT	SiC
8	Total	1.04	2.73	2.63	0.68	2.02	2.97	0.67	1.97	2.94	−35.58	−27.84	−1.47	−2.48
	Urban	1.12	2.93	2.62	0.69	2.08	3.01	0.68	2.00	2.94	−39.29	−31.74	−1.45	−3.85
	Rural	0.91	2.36	2.59	0.61	1.85	3.03	0.45	1.43	3.18	−50.55	−39.41	−26.23	−22.70
P-value*		0.015	0.544		0.437	<0.001		0.162	0.823
12	Total	2.86	6.13	2.14	2.16	5.16	2.39	1.84	4.51	2.45	−35.66	−26.43	−14.81	−12.60
	Urban	2.77	6.06	2.19	2.09	5.06	2.42	1.82	4.48	2.46	−34.30	−26.07	−12.92	−11.46
	Rural	3.02	6.26	2.07	2.40	5.57	2.32	2.09	4.92	2.35	−30.79	−21.41	−12.92	−11.67
P-value*		0.144	0.676		0.045	0.314		0.159	0.205

Statistically significant values bolded (p<0.05)

^a Values were calculated considering a complex sample design

^b Results from (2012–2000)/2000

^c Results from (2012–2006)/2006

*p-value for t-test