Antibody responses according to vaccine groups.

P: Pregnant. NP: Non-pregnant. GMT: Geometric mean titer. GMR: Geometric mean ratio. CI: Confidence interval. Sero-protection: Titer ≥40. Sero-conversion: Pre titer<10, Post titer ≥40. Significant increase: Pre titer ≥10, Post titer 4 fold Pre titer. Sero-conversion or significant increase: Percentage of total number of women in each vaccine group. †At day 0 GMT were the same in all groups (ANOVA, p = 0.51). ‡The number of women with sero-protection did not differ in any of the groups compared over time (GEE). *GMT at 3 weeks, 3 months and 10 months were adjusted for baseline titer.