Table 2. Summary of explanatory variables used to estimate highly pathogenic avian influenza infection at municipal level, South Korea

Variable	Mean	Std.Dev	Min	Max	Unit
Poultry HPAI	0.658	2.031	0.000	18.000	Case
Poultry LPAI	0.139	0.257	0.000	1.867	Case
Wild bird HPAI	0.169	0.534	0.000	5.750	Case
River density	0.036	0.411	0.000	0.327	(km2)
Agricultural land density	0.174	0.164	0.009	1.732	(km2)
Poultry density	1.296	1.962	0.000	9.013	(1,000 head/km2)
Chicken density	1.141	1.785	0.000	8.248	(1,000 head/km2)
Duck density	0.037	0.118	0.000	0.850	(1,000 head/km2)
Livestock vehicle	2.217	2.331	0.000	10.38	100 vehicles