Table 2.
Investigation of environmental factors affecting infection of Opisthorchis viverrini in Bithynia siamensis goniomphalos
| Factor | Category | Odds ratios | 95% CI | P-value |
|---|---|---|---|---|
| Infection | ||||
| Temperature | Continuous | 1.067 | 1.013–1.124 | 0.05 |
| Rainfall | Continuous | 1.139 | 1.090–1.189 | < 0.001 |
| Duration of sunshine | Continuous | 1.830 | 1.595–2.100 | < 0.001 |
| Irrigation water | Low (0.1–500,000 m3) | 0.961 | 0.652–1.417 | 0.841 |
| Medium (500,001–1,000,000 m3) | 1.502 | 1.297–1.738 | < 0.001 | |
| High (1,000,001–1,500,000 m3) | 1.300 | 1.156–1.462 | < 0.001 | |
Temperature, rainfall, and duration of sunshine were measured and multiple regression applied. Baseline for irrigation water is taken as 0 m3.