Table 4 Mean, median, and range of concentrations of antibodies to protein α and Rib in sera from case mothers (n_α  =  13 and n_Rib  =  14) and control mothers (n  =  60) compared with antibody concentrations in sera from female blood donors (n  =  100) using Wilcoxon two sample test.

	Mothers of neonates infected with				Mothers of non‐infected neonates		Female blood donors
	α‐expressing strain		Rib‐expressing strain
	Anti‐α	Anti‐Rib	Anti‐α	Anti‐Rib	Anti‐α	Anti‐Rib	Anti‐α	Anti‐Rib
Mean	0.35	0.34	0.16	0.21	0.29	0.34	0.31	0.45
Median	0.19	0.29	0.10	0.18	0.22	0.23	0.22	0.34
Range	0.05–1.22	0.03–1.25	0.01–0.46	0.03–0.52	0.02–1.21	0.04–1.65	0.01–0.99	0.05–1.71
p Value	0.98*	0.16†	0.003*	0.003†	0.75*	0.01†	–	–

Antibody concentrations are presented as absorbance values.

*Compared with anti‐α in sera from female blood donors.

†Compared with anti‐Rib in sera from female blood donors.