Table 5.
Negative binomial regression models for human RRV cases for trap sites 7–9 using a 20-km radius with 1-month lag for mosquito abundance and RRV isolate detection
| 20 km radius | Trap 7 | Trap 8 | Trap 9 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P | IRR | 95% CI | P | IRR | 95% CI | P | IRR | 95% CI | ||||
| Mosquito Q4 | NS | – | – | – | 0.010 | 3.548 | 1.359 | 9.266 | 0.000 | 7.014 | 2.389 | 20.594 |
| Mosquito Q3 | NS | – | – | – | 0.001 | 4.861 | 1.967 | 12.01 | 0.000 | 6.717 | 2.307 | 19.555 |
| Mosquito Q2 | NS | – | – | – | 0.433 | 1.499 | 0.545 | 4.121 | 0.007 | 3.709 | 1.419 | 9.693 |
| Mosquito Q1 | – | 1 | – | – | – | 1 | – | – | – | 1 | – | – |
| Isolate = Yes | 0.004 | 3.534 | 1.505 | 8.296 | 0.001 | 4.657 | 1.81 | 11.982 | NS | – | – | – |
| Isolate = No | – | 1 | – | – | – | 1 | – | – | – | – | – | – |
| Spring | 0.331 | 1.286 | 0.774 | 2.135 | 4.657 | 1.637 | 0.731 | 3.668 | 0.985 | 0.991 | 0.397 | 2.473 |
| Summer | 0.000 | 2.529 | 1.531 | 4.178 | 0.002 | 3.405 | 1.58 | 7.337 | 0.000 | 5.240 | 2.250 | 12.202 |
| Autumn (ref) | – | 1 | – | – | – | 1 | – | – | – | 1 | – | – |
IRR = incidence rate ratio; NS = not significant, therefore not included in final model; Q = quartile; RRV = Ross River virus; CI = confidence interval.