Table 2.
Key baseline data, China Jintan Cohort Study
| Areaa |
|||||
|---|---|---|---|---|---|
| City centre | Suburb | Rural | Total | ||
| Demographic Information | |||||
| n | 578 | 651 | 346 | 1575 | |
| Age | 4.67 ± 0.86 | 4.65 ± 0.90 | 4.92 ± 0.82 | 4.65 ± 0.87 | |
| Sex | 322 (55.71%) | 363 (55.76%) | 189 (54.62%) | 874 (55.49%) | |
| Male | |||||
| Female | 256 (44.29%) | 288 (44.24%) | 157 (45.38%) | 701 (44.51%) | |
| Blood assay | |||||
| Lead | n | 601 | 582 | 346 | 1576 |
| x±s | 6.25 ± 2.45 | 6.12 ± 2.90 | 6.91 ± 2.45 | 6.35 ± 2.66 | |
| G ± SD | 5.80 ± 0.15 | 5.57 ± 0.16 | 6.54 ± 0.14 | 5.86 ± 0.15 | |
| Calcium | n | 611 | 657 | 346 | 1614 |
| x±s | 1.64 ± 0.19 | 1.64 ± 0.16 | 1.67 ± 0.39 | 1.64 ± 0.24 | |
| Iron | n | 612 | 657 | 345 | 1614 |
| x±s | 8.06 ± 0.84 | 8.23 ± 0.80 | 8.05 ± 0.80 | 8.13 ± 0.82 | |
| Zinc | n | 612 | 657 | 346 | 1615 |
| x±s | 81.01 ± 14.71 | 85.21 ± 11.17 | 80.24 ± 13.00 | 82.55 ± 13.18 | |
| Magnesium | n | 612 | 657 | 346 | 1615 |
| x±s | 1.47 ± 0.17 | 1.46 ± 0.16 | 1.46 ± 0.15 | 1.47 ± 0.16 | |
| Copper | n | 612 | 657 | 346 | 1615 |
| x±s | 27.20 ± 6.83 | 27.03 ± 6.59 | 26.79 ± 6.61 | 27.04 ± 6.69 | |
aFour pre-schools are categorized into: (1) City center: Jianshe; (2) Suburb: Huacheng; and (3); Rural: Xuebu and Huashan.