Bovine tuberculosis visible lesions in cattle culled during herd breakdowns: the effects of individual characteristics, trade movement and co-infection

Table 5 Random effect multivariable logit model assessing the variation in the presence of bTB visible lesions. Bovine TB test result modelled as categories (reasons) leading to animal removal (n = 5823)

Predictor	Categories	OR	Std. Err.	z	P	Lower 95% CI	Upper 95% CI
Reason for removal	Negative in contact	Ref.
	Removed due to IFN-γ result	1.11	0.34	0.33	0.738	0.61	2.03
	Removed due to SICCT result	14.62	3.32	11.80	<0.001	9.36	22.83
Penultimate test results	Negative	Ref.
	Severe interpretation positive	2.84	0.65	4.54	<0.001	1.81	4.46
	No previous test result	0.62	0.20	−1.49	0.135	0.33	1.16
Age-class	≤ 1.53 years	1.08	0.11	0.76	0.446	0.88	1.33
	1.53–2.86 years	Ref.
	2.86–5.58 years	0.63	0.06	−4.77	<0.001	0.53	0.76
	≥5.58 years	0.65	0.06	−4.37	<0.001	0.54	0.79
Log(No. associated herds)		2.42	0.19	11.26	<0.001	2.07	2.82
Log(Time in days between tests)		1.23	0.09	2.95	0.003	1.07	1.41
Constant		0.01	0.00	−11.15	<0.001	0.01	0.02
RE	ρ^a	0.26	0.02			0.21	0.31

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