Fig. 3From: Infection risk varies within urbanized landscapes: the case of coyotes and heartwormRelationship between heartworm prevalence and a year and b age class. Whiskers are 95% confidence intervals. In panel a, the line denotes the mean infection risk by year based on a quadratic model. The shaded area denotes the 95% confidence interval, and numbers are sample sizes. No heartworm data were collected in 2006 and 2007.Back to article page