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. 2020 Aug 13;52(5):913–918. [Article in Chinese] doi: 10.19723/j.issn.1671-167X.2020.05.020

表3.

3~6岁及6~12岁儿童2014年和2016年两次调查结果的比较

Comparison of the results of two surveys in 2014 and 2016 for children aged 3-6 years and 6-12 years

Group	Age of 3-6 years					Age of 6-12 years
Group	Number	Debris index, x±s	dmft, M (P₂₅, P₇₅)	DMFT, M (P₂₅, P₇₅)		Number	Debris index, x±s	dmft, M (P₂₅, P₇₅)	DMFT, M (P₂₅, P₇₅)
Abbreviations as in Table 2.
Year 2014	373	1.69±0.48	3 (0, 6)	0 (0, 0)		619	1.89±0.48	3 (0, 5)	0 (0, 0)
Year 2016	397	1.45±0.54	2 (0, 4)	0 (0, 0)		499	1.69±0.54	2 (0, 4)	0 (0, 0)
F or Z value		F=6.838	Z=-2.735	Z=-1.032			F=6.552	Z=-2.371	Z=-0.038
P value		< 0.001	0.006	0.302			< 0.001	0.018	0.969