Table 1.

Epidemiologic surveys on experience and prevalence of early childhood caries (ECC) in Hong Kong.

Year	Reporting institution (reference)	Sample size	Age (y)	ECC prevalence (%)	ECC experience (dmft)
1960	Government9	NA	6-8	97%	9.2
1968	Government10	657	5-6	84%	5.3
1986	University11	977	5-6	63%	3.2
1997	University13	367	5	44%	1.8
2001	Government14	3,733	5	51%	2.3
2009	University16	338	5	48%	2.3
2011	Government5	1,728	5	51%	2.5
2016	University15	459	5	55%	2.7
2019	University6	404	5	57% *	2.8*

^⁎dt, untreated caries.