TABLE 3.

Transplacental transmission of pneumococcal serotype antibodies in preterm newborns

Parameter	Value in serotype:
	1 (n = 18)	3 (n = 18)	6B (n = 18)	9V (n = 18)	14 (n = 9)
Mothers
GMa (μg/ml)	1.40	0.98	1.87	1.01	2.34
95% CI	1.18–2.34	0.41–3.55	1.41–3.61	0.84–2.33	0.61–8.02
Infants
GM (μg/ml)	0.70	0.69	0.82	0.52	1.82
95% CI	0.54–1.22	0.35–2.02	0.64–1.53	0.40–1.18	0.78–4.67
P valueb	0.0007	0.4376	0.0007	0.0007	0.0977
Ratio (Mean % ± SD)	58 ± 32	94 ± 69	53 ± 30	61 ± 34	86 ± 44
r	0.837	0.551	0.693	0.849	0.963
P valuec	<0.0001	0.0179	0.0014	<0.0001	<0.0001

^aGM, geometric mean. 

^bP value represents the comparison of maternal and infant antibody concentrations (Wilcoxon signed-rank test). 

^cP value for the correlation between maternal and infant antibody concentrations.