Table 2 Estimated mean Faecal Egg Count Reduction following ivermectin treatment with associated confidence intervals by stud farm, sex and age

Foals age (months)

3

42.4 [− 28.63 to 77.0]

93.2 [10.84 to 100.0]

N/A

96.2 [95.495 to 100.0]

N/A

72.2 [35.5 to 94.1]

4

69.7 [27.6 to 99.6]

82.1 [42.31 to 100.0]

72.9 [50.0 to 100.0]

N/A

N/A

72.3 [38.3 to 95.6]

5

60.0 [43.0 to 89.5]

35.4 [14.55 to 56.5]

− 18.6 [− 45.349 to 50.0]

85.2 [72.727 to 100.0]

95.6 [90.476 to 100.0]

50.80 [32.7 to 69.0]

6

61.4 [36.158 to 86.3]

16.3 [0.745 to 39.7]

49.2 [− 20.38 to 88.7]

− 62.5 [− 333.3 to 100.0]

N/A

46.5 [22.2 to 63.5]

Foals sex

Female

50.4 [28.1 to 70.6]

62.9 [14.2 to 87.8]

21.7 [− 35.9 to 63.1]

89.3 [78.6 to 100.0]

95.5 [91.4 to 100.0]

55.8 [36.7 to 71.8]

Male

75.9 [31.0 to 100.0]

31.8 [14.7 to 58.3]

82.1 [67.3 to 98.3]

84.9 [− 333.3 to 100.0]

N/A

66.7 [40.9 to 81.9]

By farm across age and sex

57.0 [36.68 to 73.1]

56.8 [19.61 to 79.0]

44.0 [4.51 to 75.3]

86.6 [45.79 to 96.6]

96.9 [93.02 to 100.0]