Table 3. Multivariable model of variables associated with proportion of individuals testing positive for brucellosis at health facilities in Arusha region (n = 776 monthly observations from 20 facilities).

Variable	Levels	Odds Ratios	95% CI	p-value	LRT χ2	p-value
	(Intercept)	0.11	0.05 – 0.28	<0.001
District	Arusha DC (ref)	-	-	-	14.49	0.025
	Arusha Urban	1.04	0.42 – 2.60	0.930
	Karatu	0.83	0.30 – 2.26	0.713
	Longido	2.08	0.23 – 18.78	0.516
	Meru	3.59	1.14 – 11.29	0.029
	Monduli	3.49	0.93 – 13.04	0.063
	Ngorongoro	2.62	0.98–7.00	0.056
Facility type	Health center (ref)	-	-	-	4.56	0.033
	Hospital	1.89	1.07 – 3.33	0.027

CI- confidence Interval of estimate; LRT–Likelihood ratio test, χ2 –Chi square; Random Effects: σ² = 3.84; Facility-month = 0.55; Facility ID = 0.20.