Table 3 Dental condition among a sample of 12–15 years old in Gansu Province of China (n = 3848)

Gender

–

–

–

–

–

–

Female

0.70 ± 1.29

0.00 ± 0.05

0.02 ± 0.18

0.73 ± 1.31

1.9

0.6

Male

0.91 ± 1.50

0.00 ± 0.07

0.02 ± 0.19

0.93 ± 1.53

1.3

0.4

District

–

–

–

–

–

–

Urban

0.45 ± 0.91

0.01 ± 0.07

0.03 ± 0.21

0.49 ± 0.95

2.1

0.9

Rural

1.16 ± 1.70

0.00 ± 0.04

0.02 ± 0.16

1.18 ± 1.71

1.1

0.1

Age (years)

–

–

–

–

–

–

12

0.64 ± 1.15

0.00 ± 0.06

0.01 ± 0.11

0.65 ± 1.17

1.0

0.9

13

0.72 ± 1.25

0.00 ± 0.06

0.02 ± 0.17

0.74 ± 1.27

1.6

0.5

14

0.92 ± 1.51

0.00 ± 0.06

0.02 ± 0.16

0.94 ± 1.52

1.5

0.3

15

0.93 ± 1.61

0.00 ± 0.06

0.04 ± 0.26

0.97 ± 1.64

2.3

0.2

Total

0.80 ± 1.40

0.00 ± 0.06

0.02 ± 0.18

0.83 ± 1.42

1.6

0.5