Table 4. Pooled prevalence of brucellosis seropositivity by species and system or location.

Category	Subgroup	Nr	Ns	Prevalence, 95%CI			P	TP, 95% CI
Pastoral AA	Afar	15	13130	6.8	5	8.9	0.0001	7.6	5.6	9.9
	Borana	11	14852	1.9	1.2	2.8	0.0001	2.1	1.3	3.1
	Somali	11	6762	2.4	1.2	4	0.0001	2.7	1.3	4.5
	South Omo	3	1183	2.4	0.3	6.1	0.001	2.7	0.3	6.8
Camel	Afar	7	4301	4.8	3.7	5.9	0.0001	5.3	4.1	6.6
	Borana	6	7783	1.2	0.7	1.8	0.0001	1.3	0.8	2
	Somali	5	2886	2	1.5	2.6	0.0001	2.2	1.7	2.9
Cattle	Pastoral	4	2045	5	2.4	8.5	0.0001	5.3	2.5	9
	Mixed	11	9637	1.7	1.1	2.5	0.0001	1.8	1.2	2.7
	Si/I	12	9748	3.1	1.8	4.7	0.0001	3.3	1.9	5.0
Sheep/goats	Pastoral	16	19224	5.2	3.2	7.5	0.0001	6.1	3.7	8.8
	Mixed-CL	8	7691	1.3	0.7	2.1	0.0001	1.5	0.8	2.1
	Afar	9	8829	8.4	5.4	12	0.0001	9.8	6.3	14
	Borana	6	6223	1.9	0.9	3.2	0.0001	2.2	1.1	3.7
	Somali	4	3169	2.6	0.2	7.5	0.007	3	0.2	8.8
	South Omo	2	1003	1.9	0.02	7.1	0.035	2.2	0.0	8.3

Mixed-CL, mixed crop-livestock production system; Pastoral AA, all pastoral animals

Nr, number of reports; Ns, number of samples; Si/I, semi intensive and intensive production system

TP, True Prevalence.