Table 3:

Bivariable associations between IAV prevalence and explanatory variables

Variables	Categories	Estimate	p-value	OR	95% CI
Season	Winter	Reference	<0.001	0.007	(0.003-0.002)
	Autumn	0.9546	0.025	2.59	(1.12-5.97)
	Spring	0.6264	0.152	1.87	(0.79-4.41)
	Summer	1.5842	<0.001	4.87	(2.11-11.21)
Abundance of wild birds	Low (< 525)	Reference
	High (≥ 525)	0.3714	0.234	1.45	(0.79- 2.67)
Species richness	Low (< 22 sp)	Reference
	High (≥ 22 sp)	0.11	0.726	1.12	(0.60-2.06)
Abundance of migrants	Low (< 233)	Reference
	High (≥ 233)	0.8496	0.00474	2.34	(1.30 −4.22)
NDVI	Low (< 0.19)	Reference
	High (≥ 0.19)	−0.6672	0.0402	1.95	(1.03- 3.69)
NDVI 1 month bs	Low (< 0.17)	Reference
	High (≥ 0.17)	−0.5936	0.043	0.55	(0.31-0.98)
NDVI 2 month bs	Low (< 0.16)	Reference
	High (≥ 0.16)	−0.7743	0.016	0.46	(0.25- 0.87)
NDVI 3 month bs	-	−3.364	<0.001	0.03	(0.006- 0.21)
Water body size (km2)	Low (< 0.67)	Reference
	High (≥ 0.67)	−0.7489	0.021	0.47	(0.25 −0.89)
Water body size 1 month bs	Low (< 0.39)	Reference
	High (≥ 0.39)	−0.7261	0.013	0.48	(0.27 −0.86)
Water body size 2 month bs	Low (< 0.79)	Reference
	High (≥ 0.79)	−1.0491	<0.001	0.35	(0.19- 0.65)
Water body size 3 month bs	Low (< 0.56)	Reference
	High (≥ 0.56)	−0.9203	0.003	0.39	(0.22- 0.73)
Maximum temperature (°C)	Low (< 19.34)	Reference
	High (≥ 19.34)	−0.2814	0.429	0.75	(0.38- 1.52)
Maximum temperature 1 month bs	Low (< 19.20)	Reference
	High (≥ 19.20)	0.07918	0.823	1.08	(0.54- 2.16)
Maximum temperature 2 month bs	Low (< 19.34)	Reference
	High (≥ 19.34)	−0.27	0.446	0.76	(0.38- 1.53)
Maximum temperature 3 month bs	Low (< 19)	Reference
	High (≥ 19)	−0.01998	0.949	0.98	(0.53- 1.81)
Minimum temperature (°C)	Low (< 8.7)	Reference
	High (≥ 8.7)	1.2655	<0.001	3.55	(2.03 −6.19)
Minimum temperature 1 month bs	Low (< 8.7)	Reference
	High (≥ 8.7)	1.2254	<0.001	3.41	(1.90 −6.07)
Minimum temperature 2 month bs	Low (< 8.5)	Reference
	High (≥ 8.5)	0.8214	0.007	3.4	(1.87- 6.19)
Minimum temperature 3 month bs	Low (< 8.4)	Reference
	High (≥ 8.4)	0.02618	0.933	1.03	(0.55 −1.89)
Rainfall (mm)	Low (< 6.1)	Reference
	High (≥ 6.1)	−0.528	0.087	0.6	(0.32- 1.07)
Rainfall 1 month bs	Low (< 6.6)	Reference
	High (≥ 6.6)	−0.9064	0.003	0.4	(0.22 −0.73)
Rainfall 2 month bs	Low (< 5.5)	Reference
	High (≥ 5.5)	−0.4087	0.192	0.66	(0.35- 1.23)
Rainfall 3 month bs	Low (< 6.6)	Reference
	High (≥ 6.6)	−0.6086	0.048	0.54	(0.29- 0.99)

bs: before sampling