Table 2.
Descriptive characteristics of the participants (N = 4525)
| Number | Percent | 95% CI | ||
|---|---|---|---|---|
| Gingival bleeding | 2110 | 46.63 | 45.18 | 48.08 |
| Calculus | 3029 | 66.94 | 65.57 | 68.31 |
| Areas | ||||
| Pi County | 590 | 13.04 | 12.06 | 14.02 |
| Chuanshan District | 810 | 17.90 | 16.78 | 19.02 |
| Da County | 838 | 18.52 | 17.39 | 19.65 |
| Yibin County | 845 | 18.67 | 17.54 | 19.81 |
| Jinniu District | 682 | 15.07 | 14.03 | 1.11 |
| Guang’an District | 760 | 16.80 | 15.71 | 17.89 |
| Gender | ||||
| Female | 2326 | 51.40 | 49.95 | 52.86 |
| Male | 2199 | 48.60 | 47.14 | 50.05 |
| hukou | ||||
| Rural | 2320 | 51.27 | 49.81 | 52.73 |
| Urban | 2205 | 48.73 | 47.27 | 50.19 |
| Ethnicity | ||||
| Han | 4475 | 98.90 | 98.59 | 99.20 |
| Others | 50 | 1.10 | 2.80 | 1.41 |
| Family size | ||||
| One child | 2883 | 63.71 | 62.31 | 65.11 |
| More than one child | 1642 | 36.29 | 34.89 | 37.69 |
| Father’s educational level | ||||
| Middle school or lower a | 2960 | 65.41 | 64.03 | 66.80 |
| More than middle schoolb | 1565 | 34.59 | 33.20 | 35.97 |
| Mother’s educational level | ||||
| Middle school or lower a | 3314 | 73.24 | 71.95 | 74.53 |
| More than middle schoolb | 1211 | 26.76 | 25.47 | 28.05 |
| Toothbrushing frequency | ||||
| Never | 329 | 7.27 | 6.51 | 8.03 |
| Sometimes | 670 | 14.81 | 13.77 | 15.84 |
| 1 | 1925 | 42.54 | 41.10 | 43.98 |
| ≥ 2 | 1601 | 35.38 | 33.99 | 36.77 |
| Dental floss usage | ||||
| Never | 4273 | 94.43 | 93.76 | 95.10 |
| Yes | 252 | 5.57 | 4.90 | 6.24 |
| Candy/chocolate /cookies /cakes | ||||
| ≤ 1/week | 1820 | 40.22 | 38.79 | 41.65 |
| > 1/week | 2705 | 59.78 | 58.35 | 61.21 |
| Sugar-containing soft drink/soda/ milk/yogurt /tea/coffee/water | ||||
| ≤ 1/week | 2999 | 66.28 | 64.90 | 67.65 |
| > 1/week | 1526 | 33.72 | 32.35 | 35.10 |
| Dentist visit during past year | ||||
| > 0 | 991 | 21.90 | 20.70 | 23.11 |
| 0 | 3534 | 78.10 | 76.89 | 79.30 |
| Frequency of dental education (previous semester) | ||||
| > 0 | 537 | 11.87 | 10.92 | 12.81 |
| 0 | 3988 | 88.13 | 87.19 | 89.08 |
Abbreviation: aMiddle school or lower, ≤9 years; bMore than middle school, >9 years