The prevalence of dental caries, rate of pit and fissure sealant and mean value of DMFT with different districts and genders
| Group | N (%) | Dental caries | |||
| DMFT (SD) | t/F | P value | |||
| Sibling | Have | 1240 (33.24%) | 1.86±2.57 | −3.952 | <0.001 |
| Do not have | 2491 (66.76%) | 1.53±2.27 | |||
| Father’s education background | Low (junior school or below) | 2055 (55.08%) | 1.83±2.46 | 15.88 | <0.001 |
| Median (senior school) | 880 (23.59%) | 1.49±2.35 | |||
| High (college or above) | 796 (21.33%) | 1.32±2.14 | |||
| Mother’s education background | Low (junior school or below) | 2051 (54.97%) | 1.85±2.49 | 18.36 | <0.001 |
| Median (senior school) | 902 (24.18%) | 1.49±2.31 | |||
| High (college or above) | 778 (20.85%) | 1.29±2.07 | |||
DMFT, decayed–missing–filled teeth.