Table 1. Study participants*.
| Community | 2003 |
2004 |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| n | Age (y) |
Sex ratio (M:F)† | n | Age (y) |
Sex ratio (M:F) | |||||
| Mean | SD | Range | Mean | SD | Range | |||||
| Linyun | 1,047 | 24.1 | 15.4 | 1–74 | 0.90 | 738 | 22.9 | 15.4 | 1–72 | 0.96 |
| Xin'an | 1,037 | 31.3 | 17.9 | 1–87 | 0.85 | 533 | 31.8 | 18.4 | 1–87 | 0.77 |
| Guilin | 542 | 35.3 | 15.0 | 0.9–80 | 1.14 | 340 | 37.3 | 14.1 | 1–80 | 1.06 |
| Luochen | 981 | 32.5 | 19.0 | 1–85 | 0.73 | 455 | 34.2 | 19.7 | 1–79 | 0.72 |
| Tiendan | 377 | 35.1 | 16.4 | 1–70 | 0.98 | 166 | 37.2 | 16.4 | 2–70 | 0.73 |
| Binyan | 1,106 | 28.9 | 18.2 | 1–78 | 0.92 | 657 | 28.5 | 19.1 | 1–78 | 0.84 |
| Linshan | 1,230 | 27.4 | 20.5 | 0.4–87 | 0.94 | 542 | 26.2 | 21.6 | 0.5–80 | 0.97 |
| Liuzhen† | 964 | 44.6 | 16.8 | 0.1–79 | 0.88 | – | – | – | – | – |
| Total | 7,284 | 31.7 | 18.8 | 0.1–87 | 0.89 | 3,431 | 29.5 | 18.8 | 0.5–87 | 0.87 |
| M | 3,440 | 30.2 | 19.4 | 0.4–85 | – | 1,597 | 27.9 | 19.3 | 0.5–80 | – |
| F | 3,844 | 33.0 | 18.8 | 0.1–87 | – | 1,834 | 30.9 | 18.3 | 1–87 | – |
*Serum samples were taken in 2003 from 7,284 persons residing in 8 communities of Guangxi Province. Second samples were taken 12 mo later from a subpopulation of 3,431 study participants residing in 7 of these communities. *SD, standard deviation;, M = male; F = female.†Dash indicates "not done" in reference to Liuzhen and "not applicable" in reference to sex.