Table 3. Multivariate logistic regression model for exposure to bovine viral diarrhea virus (BVDV) and Anaplasma spp. among deer sampled at 11 deer assessment units (areas) in California between 1990 and 2007.

		BVDV				Anaplasma spp.
Area	n	OR	95%CI	P-value	n	OR	95%CI	P-value
1	61	2.2	0.2–23.8	0.504	461	14.2	8.0–25.2	<0.001
2	8	0	–	–	76	2.2	0.7–6.7	0.169
3	15	0	–	–	67	5.4	0.9–31.3	0.061
4	1	0	–	–	43	1.9	0.3–10.7	0.460
5	30	4.7	0.4–59.4	0.230	190	5.1	2.8–9.4	<0.001
6	–	–	–	–	54	2.8	0.5–16.5	0.260
7	67	1.0	ref	ref	250	3.7	1.6–8.5	0.003
8	50	0	–	–	247	2.0	1.0–4.2	0.066
9	45	6.4	0.9–46.4	0.065	171	2.6	1.5–4.7	0.001
10	15	132.0	21.7–803.4	<0.001	77	2.8	0.4–18.3	0.286
11	117	51.0	7.0–371.7	<0.001	767	1.0	ref	ref

0 = no samples were seropositive in this category.

ref = reference category.