Figure 2From: ABO blood group and the risk of placental malaria in sub-Saharan AfricaMeta analysis of three different studies from holoendemic settings on the association between blood group O vs. other ABO blood groups and active placental infection in primiparae. Note: The study by Adam et al [20] was excluded from the meta-analysis as no perennial transmission took place in the corresponding study site in eastern Sudan.Back to article page