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Table 1 Demographic characteristics of the participants

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

 

Boys

Girls

Total

Overall

44,404 (50.0)

44,368 (50.0)

88,772 (100)

1995

   

Total

8720 (50.4)

8585 (49.6)

17,305 (100.0)

Area

   

 Urban

4393 (50.0)

4393 (50.0)

8786 (50.8)

 Rural

4327 (50.8)

4192 (49.2)

8519 (49.2)

Region

   

 East

3385 (50.0)

3382 (50.0)

6767 (39.1)

 Central

2537 (50.0)

2537 (50.0)

5074 (29.3)

 West

2798 (51.2)

2666 (48.8)

5464 (31.6)

2000

   

Total

8748 (49.7)

8861 (50.3)

17,609 (100.0)

Area

   

 Urban

4414 (49.8)

4446 (50.2)

8860 (50.3)

 Rural

4334 (49.5)

4415 (50.5)

8749 (49.7)

Region

   

 East

3614 (48.9)

3783 (51.1)

7397 (42.0)

 Central

2281 (49.8)

2297 (50.2)

4578 (26.0)

 West

2853 (50.6)

2781 (49.4)

5634 (32.0)

2005

   

Total

9121 (50.1)

9092 (49.9)

18,213 (100.0)

Area

   

 Urban

4573 (50.1)

4549 (49.9)

9122 (50.1)

 Rural

4548 (50.0)

4543 (50.0)

9091 (49.9)

Region

   

 East

3517 (50.7)

3416 (49.3)

6933 (38.1)

 Central

2190 (49.1)

2272 (50.9)

4462 (24.5)

 West

3414 (50.1)

3404 (49.9)

6818 (37.4)

2010

   

Total

8913 (49.9)

8939 (50.1)

17,852 (100.0)

Area

   

 Urban

4452 (49.9)

4473 (50.1)

8925 (50.0)

 Rural

4461 (50.0)

4466 (50.0)

8927 (50.0)

Region

   

 East

3266 (50.0)

3272 (50.0)

6538 (36.6)

 Central

2361 (49.9)

2373 (50.1)

4734 (26.5)

 West

3286 (49.9)

3294 (50.1)

6580 (36.9)

2014

   

Total

8902 (50.0)

8891 (50.0)

17,793 (100.0)

Area

   

 Urban

4453 (50.0)

4445 (50.0)

8898 (50.0)

 Rural

4449 (50.0)

4446 (50.0)

8895 (50.0)

Region

   

 East

3282 (49.9)

3294 (50.1)

6576 (37.0)

 Central

2393 (50.0)

2390 (50.0)

4783 (26.9)

 West

3227 (50.2)

3207 (49.8)

6434 (36.2)