Table 2.

Prevalence of caries experience and fissure sealant in Korea 2000–2012 by age

Year	Living region	Age 8					Age 12
		N	DMFT=0, %	P*	Sealed, %	P*	N	DMFT=0, %	P*	Sealed, %	P*
2000	Total	1194	53.4	0.67	19.2	0.877	1203	26.0	0.006	14.8	0.011
	Urban	780	52.9		19.4		784	28.6		16.7
	Rural	414	54.3		18.8		419	21.2		11.2
2006	Total	875	69.5	1.00	38.6	<0.001	1775	39.1	0.041	33.0	0.237
	Urban	694	69.5		35.3		1386	40.4		33.8
	Rural	181	69.6		51.4		369	34.1		30.4
2012	Total	4379	69.6	0.559	62.1	0.367	5222	42.7	0.612	62.5	0.438
	Urban	3781	69.2		62.3		4565	42.8		63.0
	Rural	598	76.3		58.3		657	41.0		55.4
	P-value**
			DMFT=0, %		Sealed, %			DMFT=0, %		Sealed, %
2000 - 2006	Total		<0.001		<0.001		Total	<0.001		<0.001
	Urban		<0.001		<0.001		Urban	<0.001		<0.001
	Rural		<0.001		<0.001		Rural	<0.001		<0.001
2006 - 2012	Total		0.034		<0.001		Total	<0.001		<0.001
	Urban		0.08		<0.001		Urban	0.044		<0.001
	Rural		0.158		<0.001		Rural	<0.001		<0.001

*p-value for chi-square test

**p-value for t-test