Table 2.
Generalized estimating equation negative binomial regression model for the prediction of collection rates for life stages of Ixodes scapularis between southwestern Virginia (SW VA) and southeastern Virginia (SE VA), USA, from February 2018 to January 2019
| Tick Species, life stage | Variable | Coefficient (SE) | RR (95% CI) | P |
|---|---|---|---|---|
| Ixodes scapularis, All life stages | Season (warm vs. coola) | 0.77 (0.34) | 2.17 (1.12, 4.21) | 0.022 |
| Location (SW VA vs. SE VAa) | 1.31 (0.45) | 3.69 (1.54, 8.88) | 0.004 | |
| Constant | −0.31 (0.29) | NA | 0.293 | |
| Ixodes scapularis, Adult | Season (warm vs. coola) | −2.50 (0.33) | 0.08 (0.04, 0.16) | <0.001 |
| Location (SW VA vs. SE VAa) | −0.44 (0.73) | 0.64 (0.15, 2.66) | 0.541 | |
| Constant | 1.01 (0.50) | NA | 0.046 | |
| Ixodes scapularis, Nymph | Season (warm vs. coola) | 3.63 (0.55) | 37.68 (12.81, 110.85) | <0.001 |
| Location (SW VA vs. SE VAa) | 2.41 (0.61) | 11.15 (3.35, 37.04) | <0.001 | |
| Constant | −4.62 (0.68) | NA | <0.001 | |
| Ixodes scapularis, Larvae | Season (warm vs. coola) | 4.30 (0.98) | 73.60 (10.77, 502.78) | <0.001 |
| Location (SW VA vs. SE VAa) | 0.82 (0.27) | 2.28 (1.33, 3.89) | 0.003 | |
| Constant | −4.09 (1.01) | NA | <0.001 |
SE = standard error. RR = relative rate. CI = confidence interval. NA = not applicable.
a indicates reference category.