Trends of dental caries in permanent teeth among 12-year-old Chinese children: evidence from five consecutive national surveys between 1995 and 2014

Table 3 DMFT in 12-year-old Chinese children by gender (means, SD)

	Overall	Boys	Girls	t-test P value
1995
Total	0.38 (0.90)	0.33 (0.81)	0.44 (0.98)	< 0.001
Area
Urban	0.48 (1.00)	0.40 (0.88)	0.56 (1.10)	< 0.001
Rural	0.29 (0.78)	0.25 (0.73)	0.32 (0.83)	< 0.001
Region
East	0.52 (1.05)	0.43 (0.92)	0.62 (1.17)	< 0.001
Central	0.30 (0.80)	0.26 (0.75)	0.35 (0.84)	< 0.001
West	0.28 (0.75)	0.26 (0.69)	0.30 (0.80)	0.054
2000
Total	0.28 (0.76)	0.23 (0.68)	0.32 (0.84)	< 0.001
Area
Urban	0.31 (0.78)	0.27 (0.71)	0.35 (0.85)	< 0.001
Rural	0.25 (0.75)	0.20 (0.64)	0.30 (0.83)	< 0.001
Region
East	0.42 (0.95)	0.35 (0.84)	0.49 (1.04)	< 0.001
Central	0.14 (0.49)	0.13 (0.47)	0.15 (0.51)	0.137
West	0.20 (0.63)	0.16 (0.56)	0.24 (0.70)	< 0.001
2005
Total	0.31 (0.97)	0.25 (0.84)	0.36 (1.09)	< 0.001
Area
Urban	0.32 (1.02)	0.26 (0.81)	0.38 (1.19)	< 0.001
Rural	0.29 (0.92)	0.25 (0.86)	0.34 (0.98)	< 0.001
Region
East	0.39 (1.15)	0.31 (0.96)	0.47 (1.32)	< 0.001
Central	0.26 (0.93)	0.23 (0.84)	0.28 (1.00)	0.040
West	0.25 (0.77)	0.21 (0.68)	0.30 (0.85)	< 0.001
2010
Total	0.66 (2.13)	0.57 (1.95)	0.74 (2.28)	< 0.001
Area
Urban	0.81 (2.65)	0.71 (2.42)	0.91 (2.86)	< 0.001
Rural	0.50 (1.40)	0.44 (1.32)	0.57 (1.48)	< 0.001
Region
East	0.42 (1.03)	0.32 (0.92)	0.51 (1.11)	< 0.001
Central	0.39 (0.99)	0.34 (0.88)	0.44 (1.08)	< 0.001
West	1.09 (3.20)	0.99 (2.94)	1.18 (3.43)	0.018
2014
Total	0.54 (1.30)	0.42 (1.08)	0.66 (1.48)	< 0.001
Area
Urban	0.54 (1.27)	0.41 (1.06)	0.67 (1.45)	< 0.001
Rural	0.54 (1.33)	0.43 (1.10)	0.66 (1.51)	< 0.001
Region
East	0.69 (1.50)	0.54 (1.27)	0.84 (1.69)	< 0.001
Central	0.46 (1.19)	0.35 (0.96)	0.57 (1.37)	< 0.001
West	0.46 (1.13)	0.36 (0.94)	0.56 (1.29)	< 0.001

ISSN: 1472-6831