Table 2.

Logistic regression model of potential risk factors associated with seroprevalence to WNV and antigenically-related flaviviruses in red deer in Spain

Variable	Categories	B	P-value	OR	95 % CI
Year	2003	a	a	a	a	a
	2004	−1.174	0.271	0.309	0.038	2.496
	2005	−0.028	0.962	0.972	0.313	3.020
	2006	0.294	0.525	1.342	0.542	3.322
	2007	0.223	0.627	1.250	0.509	3.072
	2008	0.430	0.332	1.538	0.645	3.669
	2009	0.509	0.219	1.663	0.739	3.743
	2010	0.386	0.355	1.471	0.649	3.335
	2011	1.991	<0.001	7.320	3.404	15.739
	2012	−0.741	0.487	0.477	0.059	3.851
	2013	0.077	0.892	1.081	0.353	3.306
	2014	0.608	0.447	1.837	0.383	8.822
Bioregion	1	a	a	a	a	a
	2	0.602	0.605	1.826	0.186	17.946
	3	1.913	0.060	6.777	0.920	49.903
	4	1.784	0.115	5.954	0.648	54.709
	5	2.192	0.034	8.957	1.180	67.990
Wetland area	Absence	a	a	a	a	a
	Presence	1.097	<0.001	2.995	1.888	4.751

^aReference category