Table 3.

Contingency table for incidences (count) of liver abscesses for untreated (control) and animals treated with virginiamycin at 3 ranges (<15, 15 to 30, >30 mg/kg DM)

Liver abscess	Liver abscesses (all scores)					Liver abscess A+ (score 3)
incidence	Control	<15	15 to 30	>30	Total	Control	<15	15 to 30	>30	Total
No	1258	735	1855	191	4039	1258	735	1855	191	4039
Yes	583	231	571	6	1391	300	106	245	0	651
Total	1841	966	2426	197	5430	1558	841	2100	191	4690
Statistics1	Estimate				P-value	Estimate				P-value
χ2 test	95.03				< 0.001	78.2				< 0.001
Cond. Indep. test2	6.26				< 0.001	5.69				< 0.001

¹Statistical tests to assess data independence, H₀ = cell quantities are independent of classificatory variables.

²Conditional independence test.