Table 2.

Descriptive statistics of the epidemiological context features based on 10 km of radius around each outbreak farm, by farm type (indoor and outdoor).

Variables	Outbreaks in indoor farms	Outbreaks in outdoor farms
	(n = 158)	(n = 147)
Wild boar density (km2)**	4.95 (1.03)	4.56 (0.89)
Domestic pig farms density (km2)	0.71 (0.42)	0.72 (0.35)
Illegal free-ranging pigs density (km2)	0 [0–0.8]	0.3 [0–0.4]

Data are presented as mean (standard deviation), median [I-III quartile]. Statistically significant differences are identified by a p-value < 0.0001 (***), or p-value between 0.05–0.0001 (**).