Risk of tuberculosis cattle herd breakdowns in Ireland: effects of badger culling effort, density and historic large-scale interventions

Table 3 Model results relating cattle herd bovine tuberculosis breakdown risk in relationship historic intensive interventions

Annual bTB status	Odds ratio	Std. Err.	z	P?>?z	Lower 95%	Upper 95%
Reference	1.000
Removal	0.528	0.087	?3.86	0.000	0.382	0.730
2007	1.000
2008	1.095	0.249	0.40	0.689	0.701	1.711
2009	0.879	0.215	?0.53	0.598	0.544	1.420
2010	0.579	0.159	?1.99	0.047	0.337	0.993
2011	0.574	0.158	?2.01	0.044	0.334	0.986
2012	0.611	0.165	?1.83	0.068	0.360	1.036
Previous history	2.250	0.485	3.76	0.000	1.474	3.434
Log(Herdsize)	2.034	0.202	7.16	0.000	1.675	2.471
Cork*	1.000
Donegal*	0.388	0.175	?2.10	0.036	0.160	0.941
Kilkenny*	1.583	0.317	2.29	0.022	1.069	2.344
Monaghan*	0.682	0.148	?1.76	0.078	0.445	1.044

*Wald tests: Donegal?=?Kilkenny: ?² (df: 1) =9.73; Prob?>??²?=?0.002; Donegal?=?Monaghan: ?² (df: 1) =1.65; Prob?>??²?=?0.199; Kilkenny?=?Monaghan: ? ² (df: 1) =16.88; Prob?>??²?<?0.001.
The effect of historic intensive proactive culls on cattle herd breakdown risk (2007–2012) in areas that were part of a former large-scale badger cull trial during 1997–2002.

ISSN: 1297-9716