Table 5.

Weight and significance of variables remaining in the best selected model for A. phagocytophilum prevalence in I. ricinus

Variable	B	S.E.	Wald	df	P	Exp(B)
Tick developmental stage (1 = Adults)	1.065	0.140	57.700	1	<0.001	2.901
Site*Year			52.132	2	<0.001
Site1*Year 1	1.017	0.150	45.709	1	<0.001	2.764
Site1*Year 2	0.974	0.218	19.896	1	<0.001	2.648
Constant	–3.793	0.126	900.062	1	<0.001	0.023

Categorical variables codings: Site1, Bratislava; Year 1, 2011; Year 2, 2012; variables removed by backward method were year, site and season; B, parameter estimate; Wald, Wald statistic = test of significance of the regression coefficient; P, significance level