Table 1.
Independent variables according to analysis level and SDH categories
| Level | Classification | Variable | Description and categories |
|---|---|---|---|
| 1st Level—Individual | Intermediate SDH | Gender | Sex of individual, Female/Male |
| Ethnicity | Han/Others | ||
| hukou | Rural/Urban | ||
| Family size | Number of Children, One child/More than one child | ||
| Father’s educational level | Schooling of father, Middle school or lower/More than middle school | ||
| Mother’s educational level | Schooling of parents, Middle school or lower/More than middle school | ||
| Toothbrushing frequency | Never/Sometimes/1/≥2 | ||
| Dental floss usage | Never/Yes (≥0) | ||
| Candy/chocolate /cookies /cakes | ≤1/week/> 1/week | ||
| Sugar-containing soft drink/soda/ milk/yogurt /tea/coffee/water | ≤1/week/> 1/week | ||
| Dentist visit during past year | > 0/0 | ||
| Frequency of dental education (previous semester) | > 0/0 | ||
| 2st Level—Contextual | Structural SDH | Regions represent different levels of urbanization | Guang’an District, Chuanshan District, Jinniu District, Da County, Yibin County and Pi County |
Abbreviations: SDH social determinants of health