Table 2.

Results comparing the immune and nonimmune pregnant women.

	Rubella-immune IgG +ve	Rubella-susceptible IgG −ve	Total	t-test, P value
N (%)	9410 (91.6%)	866 (8.4%)	10276 (100%)
Age (years)	27.60 ± 6.1	31.3 ± 6.1	27.7 ± 6.1	3.291∗, 0.001
Gravidity	3.5 ± 2.5	3.39 ± 2.6	3.5 ± 2.5	0.944∗, 0.185
Parity	2.1 ± 2.2	1.99 ± 2.2	2.1 ± 2.2	0.755∗, 0.331
Abortion	0.47 ± 0.95	0.43 ± 0.89	0.479 ± 0.97	0.515∗, 0.276

All data are presented as means ± standard deviation. P = probability value considered significant at P < 0.05. *t-test for the difference between the two means.

IgG +ve: immunoglobulin G positive; IgG −ve: immunoglobulin G negative.