Figure 7: Boxplots of the correlations between DNA methylation levels in smoking-concordant and smoking-discordant MZ twins.
From: Genetic and environmental influences interact with age and sex in shaping the human methylome

Correlations are plotted for DNA methylation level at 65 CpGs that showed significant interaction between age and environmental variance and that were previously found to be associated with smoking12. The boxes denote the 25th and 75th percentile (bottom and top of box), and median value (horizontal band inside box). The whiskers indicate the values observed within up to 1.5 times the interquartile range above and below the box.