Table 4.
Generalized estimating equation negative binomial regression model for the prediction of collection rates for life stages of Ixodes scapularis in relation to elevation and forest characteristics in southwestern Virginia, 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) | 1.31 (0.23) | 3.69 (2.38, 5.75) | <0.001 |
| Elevation (m) | −0.06 (0.19) | 0.94 (0.65, 1.35) | 0.736 | |
| Constant | 0.92 (1.15) | NA | 0.419 | |
| Ixodes scapularis, Adult | Season (warm vs. coola) | −2.68 (0.40) | 0.07 (0.03, 0.15) | <0.001 |
| Elevation (m) | 0.56 (0.40) | 1.76 (0.80, 3.86) | 0.160 | |
| Trees per acre | −0.55 (0.40) | 0.57 (0.26,1.26) | 0.166 | |
| Constant | 0.47 (2.01) | NA | 0.815 | |
| Ixodes scapularis, Nymph | Season (warm vs. coola) | 3.61 (0.58) | 37.23 (12.04, 115.13) | <0.001 |
| Elevation (m) | 0.04 (0.26) | 1.04 (0.63, 1.73) | 0.881 | |
| Constant | −2.37 (1.26) | NA | 0.060 | |
| Ixodes scapularis, Larvae | Season (warm vs. coola) | 4.21 (1.02) | 67.37 (9.04, 501.84) | <0.001 |
| Elevation (m) | −0.07 (0.21) | 0.93 (0.62, 1.40) | 0.740 | |
| Trees per acre | −0.31 (0.07) | 0.74 (0.64, 0.84) | <0.001 | |
| Constant | −1.35 (1.57) | NA | 0.389 |
SE = standard error. RR = relative rate. CI = confidence interval. NA = not applicable.
a indicates reference category.