Table. 2.

Model averaging results from the linear regression model of the duration of the heartworm transmission season (n = 192)

Predictors	Estimate	SE	z	Pr(> |z|)	95% CI
(Intercept)	3.79	0.08	48.79	< 0.001	3.63 to 3.93
Urban zone 2	−0.1	0.11	0.9	0.37	−0.31 to 0.12
Urban zone 3	−0.41	0.11	3.74	< 0.001	−0.63 to −0.2
Urban zone 4	−0.41	0.11	3.74	< 0.001	−0.63 to −0.2
Latitude	−0.04	0.04	0.94	0.35	−0.12 to 0.04
Year	0.03	0.04	0.84	0.4	−0.04 to 0.11

Predictors were obtained from the top-ranking models (ΔAICc < 2; Additional file 1: Table S2)

For urban zone, zone 1 is the reference level.  Significant terms are those for which 95% confidence intervals [CI] do not overlap with 1 and P < 0.05.