Table 1.
Characteristics of caries-free subjects aged 1.5 years.
| Variable | All (n = 31,202) | Boy (n = 16,052) | Girl (n = 15,150) |
|---|---|---|---|
| n (%) | n (%) | n (%) | |
| Breastfeeding | 6834 (21.9) | 3416 (21.3) | 3418 (22.6) |
| Daily frequency of sweet snack intake | |||
| 0 | 764 (2.4) | 423 (2.6) | 341 (2.3) |
| 1 | 15,270 (48.9) | 7843 (48.9) | 7427 (49.0) |
| 2 | 13,529 (43.4) | 6944 (43.3) | 6585 (43.5) |
| 3 | 1639 (5.3) | 842 (5.2) | 797 (5.3) |
| Daily sugar sweetened-beverage consumption | 13,661 (43.8) | 7097 (44.2) | 6564 (43.3) |
| Child’s bedtime | |||
| Before 9 p.m. | 7081 (22.7) | 3732 (23.2) | 3349 (22.1) |
| 9~11 p.m. | 19,580 (62.8) | 10,082 (62.8) | 9498 (62.7) |
| After 11 p.m. | 1921 (6.2) | 914 (5.7) | 1007 (6.6) |
| Irregular | 2620 (8.4) | 1324 (8.2) | 1296 (8.6) |
| Daily toothbrushing by parents | 19,733 (63.2) | 9936 (61.9) | 9797 (64.7) |
| Varnish of fluoride | 26,990 (86.5) | 13,886 (86.5) | 13,104 (86.5) |
| Smoking of family members | 13,994 (44.8) | 7199 (44.8) | 6795 (44.9) |
| Order of birth | |||
| 1st | 15,323 (49.1) | 7945 (49.5) | 7378 (48.7) |
| 2nd | 11,981 (38.4) | 6084 (37.9) | 5897 (38.9) |
| 3rd or more | 3898 (12.5) | 2023 (12.6) | 1875 (12.4) |
| Cariostat score | |||
| 0.0 | 1583 (5.1) | 759 (4.7) | 824 (5.4) |
| 1.0 | 17,195 (55.1) | 8905 (55.5) | 8290 (54.7) |
| 2.0 | 11,693 (37.5) | 5990 (37.3) | 5703 (37.6) |
| 3.0 | 731 (2.3) | 398 (2.5) | 333 (2.2) |