Table 2.

Risk factors/variables	Information rate	N	n	(%)	p
Age	84,2				0,000
Age of export	79,4				0,200
Years from export	94,5				0,002
Gender	95,8				0,671
Geldings		99	34	(34)
Mares		183	62	(34)
Stallions		34	10	(29)
Sire	100				0,696
0		123	43	(35)
1		10	2	(20)
2		19	5	(26)
3		19	9	(50)
4		10	3	(30)
5		23	8	(35)
6		10	8	(80)
7		28	10	(36)
8		8	3	(38)
9		9	1	(11)
10		4	1	(25)
11		8	3	(38)
12		14	6	(43)
13		9	0	(0)
14		13	2	(15)
15		4	1	(25)
16		5	2	(40)
17		15	7	(47)
Country of examination	100				0,182
Sweden		75	25	(33)
Danmark		84	24	(29)
Germany		171	65	(38)
Culicoides inhabition	82,1				0,000
No		147	34	(23)
Yes		124	57	(46)
Housing	82,7				0,161
No		132	39	(30)
Yes		141	53	(38)
Cultivation of pasture	83.0				0,025
No		110	46	(42)
Yes		164	47	(29)
Moisture at pasture	82,1				0,000
No		156	37	(24)
Yes		115	52	(45)
Lee at pasture	82,1				0,000
No		94	17	(18)
Yes		177	72	(41)
Open water at pasture	82,4				0,01
No		143	38	(27)
Yes		129	52	(40)