Fig. 4From: Efficacy and safety of pertussis vaccination for pregnant women – a systematic review of randomised controlled trials and observational studiesIncidence of stillbirth. Forest plot of studies with data on stillbirth as outcome. The analysis included data from two cohort studies with a total of 6323 babies whose mothers received a pertussis vaccine during pregnancy and 19,075 babies whose mothers did not receive the vaccine during pregnancy. I-squared statistics for heterogeneity was 0%Back to article page