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Fig. 2 | BMC Pregnancy and Childbirth

Fig. 2

From: Efficacy and safety of pertussis vaccination for pregnant women – a systematic review of randomised controlled trials and observational studies

Fig. 2

Incidence of preterm birth. Forest plots of studies with data on preterm birth as outcome. The first analysis included data from two RCTs with a total of 85 women in antental Tdap group and 66 women in the control. The second analysis included data from two cohort studies with a total of 26,363 women in antental Tdap group and 97,770 women in control with no pertussis vaccine. I-squared statistics for heterogeneity was 0% for both analyses

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