Fig. 3From: Facilitating safety evaluation in maternal immunization trials: a retrospective cohort study to assess pregnancy outcomes and events of interest in low-risk pregnancies in EnglandCohort selection flow chart. AP, All Pregnancies; AP24+, All Pregnancies with gestational age ≥24 weeks; LR, Low-Risk pregnancies; CPRD, Clinical Practice Research Datalink; HES, Hospital Episode Statistics; N, number of pregnancies in the corresponding group/categoryBack to article page