Summary of sample groups and sites
| Group | Age (yr) | No. female, male | Sampling location |
|---|---|---|---|
| Children | |||
| Kindergarten | 3–6 | 60, 43 | Dagang Central Kindergarten, Zhenjiang City, Jiangsu Province; Taicang Weiyang Kindergarten, Suzhou City, Jiangsu Province; Taicang Huasheng Kindergarten, Suzhou City, Jiangsu Province |
| Primary school | 8–12 | 90, 71 | Dagang Central Primary School, Zhenjiang City, Jiangsu Province; Taicang Zhu Diwen Primary School, Suzhou City, Jiangsu Province |
| Middle school | 13–14 | 65, 49 | Taicang No. 2 Middle School, Suzhou City, Jiangsu Province |
| Adults | |||
| Youth | 19–24 | 55, 80 | Taicang Chien-Shiung Institute of Technology, Suzhou City, Jiangsu Province |
| Middle age | 30–50 | 66, 20 | Taicang Xingda Can Co., Ltd., Suzhou City, Jiangsu Province |
| Elderly | 60–79 | 43, 43 | Taicang Xinhu Community, Suzhou City, Jiangsu Province |
| Centenarians | >94 | 142, 56 | RuGao City, Nantong City, Jiangsu Province |
| Young soldiers | 19–24 | 12, 200 | Gansu police detachment training base and PLA training base in Lanzhou, Gansu Province |