TABLE 2.
Selenium distribution at the four study sites, People’s Republic of China, December 2003–May 2005
| Site 1 (Qionglai) (n = 500) | Site 2 (Gaomi) (n = 500) | Site 3 (Jiange) (n = 500) | Site 4 (Zichuan) (n = 500) | |
|---|---|---|---|---|
| Mean nail selenium, μg/g (SD*) | 0.434 (0.138) | 0.405 (0.086) | 0.211 (0.057) | 0.605 (0.163) |
| Estimated selenium intake, μg/day (SD) | 18.90 (9.86) | 11.66 (4.72) | 9.75 (4.47) | 46.73 (24.36) |
| Blood selenium, ng/ml (SD) (n = 200) | 121.16 (34.52) | 117.38 (22.48) | 71.88 (5.52) | 147.44 (17.42) |
| Selenium quintiles, % | ||||
| Quintile 5 (≥0.553 μg/g) | 15.2 | 5.8 | 0.2 | 59.8 |
| Quintile 4 (0.442–0.552 μg/g) | 30.4 | 23.6 | 0.4 | 26.8 |
| Quintile 3 (0.362–0.441 μg/g) | 24.2 | 40.8 | 1.2 | 11.8 |
| Quintile 2 (0.233–0.361 μg/g) | 25.8 | 28.6 | 25.2 | 1.6 |
| Quintile 1 (≤0.232 μg/g) | 4.4 | 1.2 | 73.0 | 0 |
*
SD, standard deviation.