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Table 3 Geometric (arithmetic) mean counts of live Amblyomma americanum ticks

From: Laboratory evaluations of the immediate and sustained efficacy of lotilaner (Credelio™) against four common species of ticks affecting dogs in North America

  Day Untreated control Lotilaner Comparison
Mean Range Mean Range Geometric (arithmetic) mean efficacy (%)  
Study 5 2 18.1 (18.8) 12–28 0.0 (0.0) 0–0 100 (100) t (7) = 29.3, P < 0.0001
9 16.5 (17.8) 9–29 0.1 (0.1) 0–2 99.1 (98.6) t (7) = 18.4, P < 0.0001
16 18.0 (18.6) 12–24 0.0 (0.0) 0–0 100 (100) t (7) = 29.1, P < 0.0001
23 16.0 (16.4) 12–23 0.0 (0.0) 0–0 100 (100) t (7) = 35.6, P < 0.0001
30 16.3 (16.5) 12–20 0.0 (0.0) 0–0 100 (100) t (7) = 53.3, P < 0.0001
Study 6 2 19.4 (20.0) 14–34 0.0 (0.0) 0–0 100 (100) t (9) = 38.8, P < 0.0001
9 16.2 (17.5) 5–27 0.1 (0.1) 0–1 99.0 (98.9) t (9) = 18.3, P < 0.0001
16 16.9 (18.8) 5–36 0.0 (0.0) 0–0 100 (100) t (9) = 18.0, P < 0.0001
23 18.1 (18.7) 10–24 0.0 (0.0) 0–0 100 (100) t (9) = 35.0, P < 0.0001
30 18.3 (19.3) 8–27 0.0 (0.0) 0–0 100 (100) t (9) = 26.6, P < 0.0001