Table 3 Factors influencing the clinical endpoint in 55 horses that remained healthy (H) and 57 horses that developed insect bite hypersensitivity (IBH)

Gender (males:females)

42:13

44:13

Ns

Age at import (mean year ± SD)

7.1 ± 1.55

7.5 ± 1.61

Ns

Import during the IBH season (N/%)

31 (56%)

26 (46%)

Ns

Import out of the IBH season (N/ %)

24 (44%)

31 (54%)

Ns

Mean number ± SD of summers since import until clinical outcome^a

3.6 ± 0.8

2.8 ± 1

≤ 0.001

Mean number ± SD of months since import until clinical outcome^a

39 ± 10

30 ± 12

≤ 0.001