Table 2. Geometric mean IgG values in pregnant women of Italian and foreign origin who were positive for anti-rubella IgG (≥10 IU/mL).

Origin	No.	Anti-rubella antibodies (IU/mL)
		Geometric mean	95% CI
Italian	1533	58.5	56.7-60.4
Foreign	662	51.7	49.2-54.4
P		<0.01
Total	2195	56.4	54.9-57.9