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Table 2 Output of a simulation experiment based on an experiment where treated and non-treated control groups each with 10 dogs are inoculated with 50 L3 per dog, with a mean establishment rate of 50%. Simulation was repeated 1000X, and values represent the percent of times 0, 1, 2, or >2 worms were observed at five different efficacy levels

From: A statistical approach for evaluating the effectiveness of heartworm preventive drugs: what does 100% efficacy really mean?

% of times you will see 0, 1, 2, or >2 worms

Efficacy (%)

0 worms

1 worm

2 worms

>2 worms

99.95

88.16

11.07

0.74

0.03

99.5

28.39

35.61

22.45

13.55

99

8.32

20.74

24.90

46.04

98.5

2.6

8.68

16.09

72.63

98

0.72

3.04

8.59

87.65