Fig. 6From: The prevalence of canine dirofilariasis in China: a systematic review and meta-analysisForest plot of the association between heartworm infection and risk factors. Experimental group (red) compared to control group (blue): sex (female compared to male), age (< 3 years compared to > 3 years), breed (pure breed compared to crossbreed) and management practice (indoor compared to outdoor)Back to article page