Fig. 1
From: DNA methylation links prenatal smoking exposure to later life health outcomes in offspring
Study design and analytical flow of the study. NFBC Northern Finland Birth Cohort, ALSPAC Avon Longitudinal Study of Parents and Children (m = mothers, c = children), IWBC Isle of Wight Birth Cohort. Dagger symbol denotes CpG sites identified previously in the cord blood of newborns exposed to maternal smoking in utero [11]. Asterisk denotes methylation data for persistence analysis