Table 1.
Factors influencing the probability of an individual field vole becoming infected with B. microti showing the best model for (a) all captures conforming to inclusion criteria described in text and (b) all such captures where the animal was also caught in the preceding month. ΔAIC=the change in the AIC if the single term is dropped. σ2=the variance attributable to a random effect. sd=standard deviation of σ2
| Term | Coefficient (SE) | z-value | P-value | ΔAIC |
|---|---|---|---|---|
| (a) Model for all captures | ||||
| Intercept | −6.21 (1.40) | −4.45 | <0.001 | — |
| Weight | 0.45 (0.14) | 3.22 | 0.001 | — |
| Weight^2 | −0.01 (0.003) | −2.68 | 0.007 | 7.6 |
| Recaptured | −1.16 (0.29) | −4.04 | <0.001 | 18.9 |
| Ticks | 0.09 (0.04) | 2.50 | 0.012 | 3.6 |
| A. phagocytophilum | 0.89 (0.37) | 2.40 | 0.016 | 3.0 |
| Random effect: site * session | σ2=0.37; sd=0.61 | |||
| Random effect: tag | σ2=0.61; sd=0.78 | |||
| (b) Model for data of animals caught in preceding month | ||||
| Intercept | −0.12 (1.34) | −0.09 | 0.93 | — |
| Weight | −0.14 (0.07) | −2.06 | 0.039 | 3.5 |
| A. phagocytophilum | 2.16 (0.63) | 3.41 | <0.001 | 8.8 |
| A. phagocytophilum last session | 2.11 (0.59) | 3.60 | <0.001 | 9.4 |
| Random effect: site * session | σ2=1.37; sd=1.17 | |||