Fig. 2From: A statistical approach for evaluating the effectiveness of heartworm preventive drugs: what does 100% efficacy really mean?Efficacy distribution histogram of results from parametric bootstrap analysis of efficacy data for the milbemycin oxime group as reported in Snyder et al. [10]. Mean and 95% confidence interval for efficacy are 99.8% (99.2, 100). Note that although one worm was seen in the biological experiment, the parametric bootstrap analysis yielded 100% efficacy more than 50% of the timeBack to article page