Table 3.

Multivariate analysis of risk factors associated with animal-level prevalence of Mycobacterium avium subspecies paratuberculosis (MAP) and bovine leukemia virus (BLV) in commercial dairy and beef cattle in northern and northeastern China.

Agents	Variablesa	Adjusted odds ratiob	95% confidence interval	P value
MAP	Age
	≤1 year	Reference
	2-3 year	0.792	0.594–1.056	0.112
	4-5 year	1.503	1.117–2.020	0.007
	≥6 year	2.033	1.537–2.689	<0.001
	Abortion history
	No	Reference
	Yes	2.334	1.833–2.971	<0.001
BLV	Age
	≤1 year	Reference
	2-3 year	1.511	1.194–1.913	<0.001
	4-5 year	1.775	1.363–2.311	<0.001
	≥6 year	2.337	1.816–3.009	<0.001

^aThe variables included were those with a P ≤ 0.20 obtained in the bivariate analysis.

^bAdjusted by region and the rest of characteristics included in this table.