Table 2. Results of models including only a single circle or annulus with the aim of investigating associations between herd-breakdowns and the number of badgers culled within the RBCT within the previous year, while adjusting for confirmed herd breakdowns and other herd-levels covariates.

Results are presented of analyses based on data quantified, where appropriate, within a 1km radius, a 1-3km annulus, and a 3-5km annulus of the case-control. Estimated odds ratios and their confidence intervals correspond to the change in risk of herd breakdown associated with a doubling of that variable.

	Odds ratio (95% confidence interval); p-value
Variable	<1km*	1-3km	3-5km
Number of badgers culled in the previous year	1.28 (1.14–1.44); <0.001	1.45 (1.27–1.66); <0.001	1.46 (1.27–1.69); <0.001
Number of confirmed herd breakdowns in the previous year.	1.24 (0.96–1.60); 0.097	0.84 (0.57–1.25); 0.402	0.71 (0.46–1.10); 0.131
Dairy herd	1.98 (1.08–3.72); 0.030	2.31 (1.23–4.35); 0.009	2.46 (1.29–4.72); 0.007
Herd size	0.97 (0.86–1.10); 0.642	0.95 (0.85–1.09); 0.538	0.96 (0.85–1.08); 0.509
Farm area	23.57 (7.66–68.07); <0.001	21.14 (6.88–64.99); <0.001	31.03 (9.51–101.23); <0.001
Confirmed historic incidence	0.94 (0.51–1.74); 0.844	0.87 (0.44–1.71); 0.681	0.79 (0.40–1.54); 0.477
Number of tested, unrestricted herds in the previous year	0.83 (0.65–1.06); 0.131	0.80 (0.58–1.11); 0.187	0.87 (0.64–1.20); 0.403
Negative log likelihood	103.63	97.75	100.54
Degrees of freedom	213	213	213

*These results were previously published by Vial and Donnelly (2012) in Table 2.