Maternal Benzene Exposure during Pregnancy and Risk of Childhood Acute Lymphoblastic Leukemia: A Meta-Analysis of Epidemiologic Studies
Figure 3
Forest plot of the association between maternal smoking during pregnancy and risk of childhood ALL.
Considering study type may be the source of heterogeneity (P = 0.032), studies are divided into two subgroups (seventeen case-control studies (P = 0.134) and one cohort study). For studies of Abadi-Korek et al. [48] and Ferreira et al. [45], Crude odds ratios are calculated from the data provided.