Table 4
Comparison of sociodemographic characteristics between exposed and unexposed villages according to census survey in 1980 and 1990
| 1980 census | 1990 census | |||||
|---|---|---|---|---|---|---|
| Parameters | E(+) | E(−) | p (χ2test) | E(+) | E(−) | p (χ2test) |
| E(+), downstream village; E(−), upstream village. | ||||||
| NS, not significant. | ||||||
| *Professional, technical, administrative, superintendents, clerical, sales, and services workers. | ||||||
| †Producers, transportation operators, and labourers. | ||||||
| Population (numbers of residents) | 11647 | 10282 | – | 9282 | 13084 | – |
| Gender (%) | NS | NS | ||||
| Male | 52.55 | 51.64 | 50.40 | 50.98 | ||
| Female | 47.45 | 48.36 | 49.60 | 49.02 | ||
| Marriage (%) | 38.81 | 39.56 | NS | 43.01 | 42.04 | NS |
| Age (%) | NS | NS | ||||
| Young people (aged below 14) | 38.41 | 38.12 | 32.05 | 33.11 | ||
| Adult (aged 15–64) | 59.39 | 59.91 | 64.03 | 62.56 | ||
| Old people (aged over 65) | 2.20 | 1.97 | 3.92 | 4.33 | ||
| % educated above college level | 6.00 | 4.18 | <0.01 | 10.92 | 6.75 | <0.01 |
| % employed | 57.51 | 57.28 | NS | 53.58 | 54.22 | NS |
| Occupation (%) | <0.01 | <0.01 | ||||
| Agriculture, fishery | 7.98 | 7.49 | 7.19 | 6.85 | ||
| White collar* | 33.26 | 28.72 | 34.55 | 28.66 | ||
| Blue collar† | 50.18 | 55.86 | 50.33 | 56.35 | ||
