Table 1.
Demographic data.
| Group 1 (n = 29) | Group 2 (n = 29) | Group 3 (n = 21) | p value | |
| Mean maternal age (years) | 30.1 | 32.5 | 28.5 | 0.03a |
| Mean parity | 3.3 | 5.2 | 2.7 | <0.05a |
| Mean gestational age at delivery (weeks) | 39.5 | 39.3 | 38.8 | 0.29 |
| Number of pre-term delivery | 0 | 0 | 0 | n/a |
| Mode of delivery, NVD, No. (%) | 24(82.8) | 26(89.7) | 18(85.7) | 0.86 |
| Mean neonatal antibody titer U/ml | 83.7 | 225.5 | n/a | <0.05a |
| Mean birth weight (grams) | 3311.9 | 3382.1 | 3159.8 | 0.46 |
Continuous parameters were analyzed by one sided ANOVA test. Chi-square analysis was used to compare mode of delivery.
No number, NVD Normal vaginal delivery.
aClinical parameters did not differ among the groups, except for parity and maternal age which was significantly higher in the vaccinated group (group 2), as compared to the other two groups (ANOVA; P = 0.002 and P = 0.03 respectively). Mean neonatal antibody level were significantly higher in the vaccinated group (group 2).