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Table 3 Arithmetic mean and geometric mean of Ixodes ricinus (attached and not attached) counts 48 h after treatment (Day 2) or 48 h after each re-infestation (Days 9, 16, 23, 30, 37)

From: Efficacy of a fixed combination of permethrin 54.5% and fipronil 6.1% (Effitix®) in dogs experimentally infested with Ixodes ricinus

Day Group 1: negative control Group 2: treated (Effitix®)
Arithmetic mean Standard deviation Geometric mean Arithmetic mean Standard deviation Geometric mean
+2 21.3 3.1 21.1 0.5 (1) 0.8 0.4
+9 17.5 3.4 17.2 0.0 (1) 0.0 0.0
+16 16.5 3.8 16.2 0.0 (1) 0.0 0.0
+23 19.7 3.1 19.5 0.0 (1) 0.0 0.0
+30 20.8 3.8 20.5 1.5 (1) 2.8 0.7
+37 21.2 2.1 21.1 1.0 (1) 0.9 0.8
  1. 1: Group 2 differed statistically significantly (p < 0.05) from the untreated control Group 1 on all assessment days.