Table 1 Frequency of dental caries according to general characteristics of study subjects
Characteristics | Deciduous teeth | Permanent teeth | ||||||
|---|---|---|---|---|---|---|---|---|
N | ds (≥1) | fs (≥1) | dfs (≥1) | N | DS (≥1) | FS (≥1) | DMFS (≥1) | |
% | % | % | % | % | % | |||
All | 1,241 | 41.9 | 72.8 | 81.7 | 1,564 | 16.3 | 33.4 | 44.6 |
Gender | ||||||||
Boy | 646 | 44.6 | 74.6 | 83.1 | 806 | 14.9 | 31.0 | 41.1 |
Girl | 595 | 39.0 | 70.8 | 80.2 | 758 | 17.8 | 36.0 | 48.4 |
p-value | 0.05 | 0.14 | 0.20 | 0.14 | 0.04 | 0.004 | ||
Age (years) | ||||||||
≤ 9 | 933 | 42.3 | 74.3 | 81.9 | 963 | 13.4 | 29.7 | 39.6 |
10 | 62 | 37.1 | 64.5 | 77.4 | 92 | 16.3 | 34.8 | 44.6 |
11 | 177 | 43.5 | 70.1 | 83.1 | 300 | 22.0 | 39.3 | 53.0 |
≥ 12 | 69 | 36.2 | 66.7 | 79.7 | 209 | 21.5 | 41.6 | 56.0 |
Mean (SD) | 9.8 (1.1) | 10.2 (1.3) | ||||||
p-value | 0.62 | 0.16 | 0.76 | 0.001 | 0.001 | <0.0001 | ||
Living area | ||||||||
Urban (Seoul,Daegu) | 757 | 38.6 | 73.4 | 80.6 | 986 | 14.4 | 35.0 | 44.1 |
Industrial (Busan) | 216 | 54.2 | 78.7 | 88.4 | 226 | 21.7 | 39.4 | 55.8 |
Rural (Cheonan) | 268 | 41.4 | 66.0 | 79.5 | 352 | 18.2 | 25.3 | 38.9 |
p-value | 0.0002 | 0.01 | 0.02 | 0.02 | 0.001 | 0.0003 | ||
Educational level of father (years) | ||||||||
≤ 12 | 436 | 48.4 | 73.2 | 83.5 | 572 | 19.6 | 34.1 | 48.6 |
> 12 | 641 | 36.5 | 73.3 | 80.2 | 774 | 11.8 | 31.5 | 38.9 |
Unknown | 164 | 45.7 | 69.5 | 82.9 | 218 | 23.9 | 38.5 | 54.6 |
p-value | 0.01 | 0.92 | 0.94 | <0.0001 | 0.56 | 0.05 | ||
Educational level of mother (years) | ||||||||
≤ 12 | 583 | 44.6 | 73.2 | 82.5 | 745 | 19.9 | 33.3 | 47.2 |
> 12 | 496 | 36.9 | 73.4 | 80.2 | 599 | 9.8 | 32.1 | 38.1 |
Unknown | 162 | 47.5 | 69.1 | 83.3 | 220 | 21.8 | 37.7 | 53.6 |
p-value | 0.19 | 0.99 | 0.97 | <0.0001 | 0.30 | 0.004 | ||
Parental marital status | ||||||||
Single | 147 | 52.4 | 71.4 | 85.7 | 200 | 27.0 | 33.5 | 52.5 |
Couple | 1,039 | 39.6 | 73.1 | 80.8 | 1286 | 14.0 | 33.1 | 42.8 |
Unknown | 55 | 58.2 | 70.9 | 87.3 | 78 | 26.9 | 38.5 | 55.1 |
p-value | 0.03 | 0.98 | 0.40 | <0.0001 | 0.84 | 0.08 | ||
Household income (1,000KRW) | ||||||||
< 2000 | 248 | 48.4 | 71.4 | 84.7 | 343 | 25.4 | 33.8 | 51.6 |
2000–2990 | 367 | 41.1 | 70.0 | 79.0 | 452 | 16.2 | 35.2 | 45.4 |
3000–3990 | 255 | 43.5 | 73.3 | 81.6 | 318 | 12.9 | 33.0 | 42.5 |
≥ 4000 | 280 | 35.0 | 76.8 | 81.4 | 333 | 9.9 | 32.1 | 38.7 |
Unknown | 91 | 44.0 | 73.6 | 85.7 | 118 | 17.8 | 30.5 | 44.1 |
p-value | 0.02 | 0.27 | 0.37 | 0.05 | 0.83 | 0.01 | ||
Urinary cotinine concentration (ug/g cr.) | ||||||||
≤ 3.0 | 585 | 40.9 | 72.1 | 81.4 | 761 | 16.0 | 33.2 | 44.0 |
> 3.0 | 346 | 45.1 | 76.3 | 82.7 | 382 | 16.8 | 30.9 | 41.4 |
Unknown | 310 | 40.3 | 70.0 | 81.3 | 421 | 16.4 | 36.1 | 48.7 |
Mean (SD) | 2.15 (3.21) | 1.93 (3.24) | ||||||
p-value | 0.23 | 0.19 | 0.68 | 0.82 | 0.46 | 0.43 | ||