Table 1.
Main characteristics of the preschool children included in the study.
| Characteristics | N (%) |
|---|---|
| Sex | |
| Male | 1087 (53.9%) |
| Female | 931 (46.1%) |
| Age (years) | |
| <3 | 65 (3.2%) |
| 3 to <4 | 294 (14.6%) |
| 4 to <5 | 604 (29.9%) |
| 5 to <6 | 670 (33.2%) |
| ≥6 | 385 (19.1%) |
| Residence | |
| Outlander | 765 (37.9%) |
| Native | 1253 (62.1%) |
| Town | |
| Fengjiang | 1264 (62.6%) |
| Pengjie | 754 (37.4%) |
| Father's education | |
| Primary school | 585 (29.0%) |
| Middle and high school | 1335 (66.2%) |
| College or higher | 98 (4.9%) |
| Father's occupation | |
| Lead-related | 1033 (51.2%) |
| Not lead-related | 985 (48.8%) |
| Mother's education | |
| Primary school | 709 (35.1%) |
| Middle and high school | 1197 (59.3%) |
| College or higher | 112 (5.6%) |
| Mother's occupation | |
| Lead-related | 926 (45.9%) |
| Not lead-related | 1092 (54.1%) |
| Cares' education | |
| Primary school | 877 (43.5%) |
| Middle and high school | 1055 (52.3%) |
| College or higher | 86 (4.3%) |
| Yearly household income (RMB) | |
| <10000 | 679 (33.7%) |
| 10000–15000 | 977 (48.4%) |
| >15000 | 362 (17.9%) |