Figure 3.

Stacked barplot of the number of years that each holding spends in the three interval categories. The numbers on the right hand side are the numbers of years spent in each testing interval. The y-axis (left hand) is the proportion of all herds in the column.

Bessell et al. BMC Veterinary Research 2012 8:51   doi:10.1186/1746-6148-8-51
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