Figure 6.

Distribution of the infection risk posed by each selling herd type. A Infection risk posed per herd type. Each box contains values between the first and the third quartiles, the horizontal line corresponding to the median. Vertical lines outside the boxes extend to 10^th and 90^th percentiles. B Tukey test-95% family-wise confidence level for each combination of herd types. The figure presents the value of the difference between the means and their respective 95% CI. The vertical dashed line indicates the point where the difference in means is zero. Herd types are described in Table 1. For the definition of infection risk posed see text.