Table 1.

A total number of cattle samples tested and seroprevalence for anti-nucleoprotein Rift Valley fever virus antibody in the four regions of Tanzania

Variables	Levels	Total animals	Negative animals	Positive animals	Doubtful animals	Overall seroprevalence	P-Value
Regions	Dodoma	171	158	10	3	5.9	0.001*
	Manyara	84	84	0	0	0
	Mbeya	87	64	23	0	26.4
	Singida	101	99	1	1	0.9
Sex	Male	167	156	11	0	6.6	0.2288
	Female	276	249	23	4	8.3
Grazing	Indoors	24	17	3	0	15	0.4173
	Extensive	419	388	31	4	7.4
Breed	Indigenous	387	358	25	4	6.5	0.03237
	Exotic	56	47	9	0	16.1
Age	Young	164	157	6	3	3.7	0.04393
	Adult	279	248	28	1	10.1

Analysis performed by chi-squared test.

* Shows variables with a significant difference by chi-squared test at a CI of 99%.