TABLE 5.
Generalized estimating equation parameter estimates and significance values for variables significantly associated with campylobacter concentrations in surface waters in a multivariate model
| Independent variable | Parameter estimate (β) | SE | P |
|---|---|---|---|
| Season | |||
| Summer | 3.83 | 0.63 | <0.0001 |
| Spring | 2.91 | 0.49 | 0.0298 |
| Winter and fall | Reference | ||
| Site | |||
| Site 1 | 4.40 | 0.74 | <0.0001 |
| Site 2 | 5.54 | 0.70 | <0.0001 |
| Site 3 | 1.99 | 0.64 | 0.016 |
| Site 4 | 3.25 | 0.78 | <0.0001 |
| Site 5 | 2.21 | 0.63 | <0.0001 |
| Site 6 | Reference | ||
| Total rainfall (inches) 30 days before sample collection | 0.065 | 0.0978 | <0.0001 |
| Interactions | |||
| Summer + 30-day total rainfall | 0.1089 | 0.0427 | 0.01 |
| Spring + 30-day total rainfall | −0.7252 | 0.0864 | <0.0001 |