Table 6.

Association between Brucella seropositivity and reproductive performance of cattle in the study area assessed by logistic regression

Factors	Level	n	Test +ve	%	OR	95 % CI	Z-test	P value
NSPC	1a	262	2	0.8
	2	82	5	6	8.3974	41.96–46.23	2.5147	0.011
	≥3	29	10	34.5	62.053	303.4–311.55	5.0546	0.000
Calving interval	1 ≤ 2 yearsa	218	4	1.8
	1 years	48	1	2.1	8.609	0.005–0.351	3.0178	0.003
	>2 years	33	11	33.3	27.622	0.011–0.127	84.683	0.000
Reproductive status	Heifera	85	1	1.2
	Lactating	140	2	1.4	0.821	0.073–9.20		0.87
	Dry	107	4	3.7	2.68	0.481–9.91	1.8413	0.26
	Pregnant	148	11	7.4	5.54	1.21–25.46	−1.996	0.028

^aOthers were computed in reference to this category