Table 1.

Adjusted relative risks and 95% confidence intervals for the associations between Japanese encephalitis virus outbreaks and each landscape feature as derived from the best fitting inhomogeneous Poisson models. Each landscape feature is adjusted for all others in each of the two models.

Landscape feature	Relative risk	95% confidence interval	P-value
Model 1: Freshwater marsh–rain-fed crops interaction
Ardeidae landscape suitability (%)	2.77	1.15–6.69	0.01
Pig density (deciles)	1.30	1.22–1.39	<0.00001
Chicken density (deciles)	1.09	1.03–1.15	0.003
Distance to river (km)	0.997	0.995–0.999	0.005
Distance to freshwater marsh (km)	0.996	0.995–0.997	<0.00001
Distance to fragmented rain-fed agriculture (km)	0.976	0.968–0.985	<0.00001
Freshwater marsh:fragmented rain-fed agriculture	1.00008	1.00005–1.0001	<0.00001
Mean precipitation during the wettest quarter (10 cm)	1.008	1.006–1.009	<0.00001
Mean precipitation during the driest quarter (10 cm)	1.15	1.10–1.20	<0.00001
Model 2: River–rain-fed crops interaction
Ardeidae landscape suitability (%)	2.44	1.02–5.86	0.0002
Pig density (deciles)	1.29	1.20–1.38	<0.00001
Chicken density (deciles)	1.09	1.03–1.16	0.001
Distance to river (km)	0.996	0.994–0.998	0.00007
Distance to freshwater marsh (km)	0.997	0.996–0.998	<0.00001
Distance to fragmented rain-fed agriculture (km)	0.978	0.970–0.987	<0.00001
River:fragmented rain-fed agriculture	1.0001	1.00007–1.0002	<0.00001
Mean precipitation during the wettest quarter (10 cm)	1.007	1.006–1.009	<0.00001
Mean precipitation during the driest quarter (10 cm)	1.15	1.10–1.20	<0.00001