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Table 3 Relative risk of having an abortion (induced or accidental) among OCV recipients compared to that of placebo recipients

From: Safety of a bivalent, killed, whole-cell oral cholera vaccine in pregnant women in Bangladesh: evidence from a randomized placebo-controlled trial

Pregnancy outcome OCV recipients Placebo recipients Crude RR (95% CI, p-value)  
Cases/ Population Rate/1000 Cases/ Population Rate/1000
Pregnant during vaccination
 Abortion 21/252 83.33 23/257 89.5 0.93 (0.52–1.64, 0.805)  
Pregnant after vaccination
 Abortion 60/337 178.0 61/360 169.4 1.05 (0.76–1.45, 0.765)