Table 2 Flea counts, number of dogs with zero flea counts and percent efficacy of 54.5% permethrin and 6.1% fipronil solution. Range, median, arithmetic and geometric means of flea counts of 54.5% permethrin and 6.1% fipronil-treated (group A) and of sham-treated (group B) dogs, number of group A and group B dogs with zero flea counts at the beginning of the trial (day 0) and after 14, 28, 56 and 84 days and percent efficacy of the 54.5% permethrin and 6.1% fipronil solution
Day 0 | Day 14 | Day 28 | Day 56 | Day 84 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Flea counts | ||||||||||
Group | A | B | A | B | A | B | A | B | A | B |
Range | 18–69 | 18–48 | 0–17 | 14–45 | 0–48 | 11–46 | 0–17 | 18–51 | 0–36 | 14–44 |
Median | 29 | 28 | 0 | 33 | 1 | 35 | 0 | 32 | 0 | 28 |
Arithmetic mean | 31.5 | 29.3 | 3.1 | 30.7 | 7.4 | 34.4 | 2.3 | 32.4 | 4.7 | 28.1 |
Geometric mean | 29.6 | 28.3 | 0.8 | 29.4 | 1.3 | 32.7 | 0.7 | 31.5 | 1.0 | 26.9 |
Number (%) of dogs with zero flea counts | ||||||||||
Group A (n = 15) | 0 (0) | 10 (71.4) | 6 (42.9) | 10 (71.4) | 10 (71.4) | |||||
Group B (n = 15) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | |||||
Percent efficacy of 54.5% permethrin and 6.1% fipronil solution | ||||||||||
Arithmetic mean | 89.8 | 78.6 | 92.9 | 83.3 | ||||||
Geometric mean | 97.1 | 96.1 | 97.8 | 96.6 | ||||||