Effect of Brucella Infection on Reproduction Conditions of Female Breeding Cattle and Its Public Health Significance in Western Tigray, Northern Ethiopia

Table 2

Summary results of the univariable and multivariable logistic regression (LR) analyses of reproductive conditions with dependent Brucella seropositivity in female cattle in Western Tigray, North West Ethiopia. OR: odds ratio, CI: confidence interval, October 2007 to February 2008.

Reproductive conditions	Category level	𝑛	Prevalence	Univariable LR analysis result				Multivariable LR analysis results
				𝑃-value	OR	95% CI of OR		𝑃-value	OR	95% CI of OR
						Lower	Upper			Lower	Upper
Reproductive status	Heifer	506	3.7	0.021				0.953	0.991	0.742	1.324
	Pregnant	244	8.6	0.007	2.414	1.272	4.580
	Lactating	286	5.6	0.229	1.519	0.768	3.003
	Dry	318	8.2	0.008	2.282	1.241	4.196
	Subtotal	1,354	6.1	—	—	—	—
Parity status	No parity	578	3.8	0.011				0.042	1.491	1.014	2.192
	One or two	274	6.9	0.049	1.883	1.001	3.541
	More than two	502	8.2	0.003	2.248	1.320	3.828
	Subtotal	1,354	6.1	—	—	—	—
Stage of pregnancy	Non pregnant	1,110	5.5	0.0024	—	—	—	>0.0001	2.96	1.86	3.49
	<5 months	146	6.2	0.082	2.92	0.98	8.27
	≥5 months	98	12.2	>0.0001	7.85	2.98	20.79
	Subtotal	1,354	6.1	—	—	—	—