Table 1.

Questionnaire data collected on the participating horse farms.

Information	Descriptor
Farm location	Zip code
Age of horses	Years
Time since last anthelmintic treatment	Months < 3; < 6; < 12; < 24; < 36; ≤ 48
Anthelmintic	Drug used at last treatment
Signs of colica last 24 months	Yes/No
Tested positive for Strongylus vulgaris during the last 24 months	Yes/No
Deworming routines applied on the farm	i) only after FECb ii) after FEC and cultivation for S. vulgaris iii) routine deworming 1-4 times/ year

^a restlessness and pawing at the ground, irritated kicking to the stomach, rolling or attempting to roll ^b faecal egg count.