Occurrence and Risk Factors of Brucellosis in Commercial Cattle Farms from Selected Districts of the Eastern Coast Zone, Tanzania

Table 3

Multivariate logistic regression analysis showing risk factors associated with the brucellosis seroprevalence in cattle from 20 commercial dairy farms in the eastern coast zone of Tanzania.

Variable	Levels	Odds ratio	95% CI	value
Sex	Male^a
	Female	1.8	1.2–2.8	0.006
Age	Adult^a
	Young	3.6	2.1–6.2	<0.001
Season	Dry^a
	Wet	3.4	2.2–5.2	<0.001
Location	Peri-urban^a
	Rural	4.8	2.0–11.5	<0.001
Contact with wildlife	Yes^a
	No	2.97	1.4–2.3	0.004
Herd size	Small^a
	Medium	12.5	6.9–22.9	<0.001

^a = Reference category. CI=Confidence interval.