Table 4.

Proportion of pigs (mean ± s.e.) with different levels of tail damage and blood presence scores recorded before the onset of outbreaks and after outbreaks were resolved.

Tail Damage	Before 1	After 2	Test	p-Value
Score 0	0.11 ± 0.02	0.15 ± 0.03	U = 1115.0	0.481
Score 2 & 3	0.26 ± 0.03	0.10 ± 0.02	t = 4.00	< 0.001
Score 3	0.09 ± 0.02	0.02 ± 0.01	U = 1397.0	0.006
Blood Presence	Before 1	After 2	Test	p-Value
Score 0	0.21 ± 0.03	0.35 ± 0.04	t = −2.77	0.007
Score 2 & 3	0.38 ± 0.04	0.16 ± 0.03	t = 4.67	< 0.001
Score 3	0.08 ± 0.02	0.03 ± 0.01	U = 1334.5	0.048

¹ Score recorded on average 6.9 ± 0.8 days before outbreaks began. ² Score recorded on average 8.6 ± 1.0 days after outbreaks finished.