Table 2.
Incidence of dental caries in 3-years old subjects.
| Variables | All subjects (n = 31,202) | Boy (n = 16,052) | Girl (n = 15,150) | |||
|---|---|---|---|---|---|---|
| n (%) | p a | n (%) | p a | n (%) | p a | |
| Incidence of dental caries | 5106 (16.4) | 2777 (17.3) | 2329 (15.4) | <0.001 | ||
| Breastfeeding | <0.001 | <0.001 | <0.001 | |||
| No | 3422 (14.2) | 1856 (14.7) | 1566 (13.3) | |||
| Yes | 1684 (24.6) | 921 (27.0) | 763 (22.3) | |||
| Daily frequency of sweet snack intake | <0.001 | <0.001 | <0.001 | |||
| 0 | 43 (5.6) | 22 (5.2) | 21 (6.2) | |||
| 1 | 1925 (12.6) | 1054 (13.4) | 871 (11.7) | |||
| 2 | 2733 (20.2) | 1482 (21.3) | 1251 (19.0) | |||
| 3 | 405 (24.7) | 219 (26.0) | 186 (23.3) | |||
| Daily sugar-sweetened beverage consumption | <0.001 | <0.001 | <0.001 | |||
| No | 2324 (13.2) | 1254 (14.0) | 1070 (12.5) | |||
| Yes | 2782 (20.4) | 1523 (21.5) | 1259 (19.2) | |||
| Child’s bedtime | <0.001 | <0.001 | <0.001 | |||
| Before 9 p.m. | 852 (12.0) | 480 (12.9) | 372 (11.1) | |||
| 9~11 p.m. | 3256 (16.6) | 1789 (17.7) | 1467 (15.4) | |||
| After 11 p.m. | 430 (22.4) | 195 (21.3) | 235 (23.3) | |||
| Irregular | 568 (21.7) | 313 (23.6) | 255 (19.7) | |||
| Daily toothbrushing by parents | <0.001 | <0.001 | <0.001 | |||
| Yes | 2708 (13.7) | 1439 (14.5) | 1269 (13.0) | |||
| No | 2398 (20.9) | 1338 (21.9) | 1060 (19.8) | |||
| Varnish of fluoride | <0.001 | <0.001 | <0.001 | |||
| Yes | 4130 (15.3) | 2240 (16.1) | 1890 (14.4) | |||
| No | 976 (23.2) | 537 (24.8) | 439 (21.5) | |||
| Smoking of family members | <0.001 | <0.001 | <0.001 | |||
| No | 2317 (13.5) | 1266 | (14.3) | 1051 (12.6) | ||
| Yes | 2789 (19.9) | 1511 | (21.0) | 1278 (18.8) | ||
| Order of birth | <0.001 | <0.001 | <0.001 | |||
| 1st | 1933 (12.6) | 1085 (13.7) | 848 (11.5) | |||
| 2nd | 2121 (17.7) | 1125 (18.5) | 996 (16.9) | |||
| 3rd or more | 1052 (27.0) | 567 (28.0) | 485 (25.4) | |||
| Cariostat score | <0.001 | <0.001 | <0.001 | |||
| 0.0 | 155 (9.8) | 79 (10.4) | 76 (9.2) | |||
| 1.0 | 2347 (13.6) | 1288 (14.5) | 1059 (12.8) | |||
| 2.0 | 2339 (20.0) | 1259 (21.0) | 1080 (18.9) | |||
| 3.0 | 265 (36.3) | 151 (37.9) | 114 (34.2) | |||
a χ2 test was used for group comparison.