Table 2.

Comparison of antibody level in serum and milk (Wilcoxon test).

	N	Min	25%	Median	75%	Max	Wilcoxon Rank Sign Test p-Value
OD milk	42	0.37	0.67	0.81	1.20	1.60
OD serum	42	0.05	0.15	0.27	0.78	1.68
Diff OD	42	−1.26	−0.71	−0.46	−0.20	0.58	<0.0001
Index milk	42	0.40	0.54	0.60	0.64	0.78
Index serum	42	0.05	0.12	0.20	0.53	0.93
Diff Index	42	−0.65	−0.44	−0.32	−0.14	0.39	<0.0001