4 CHAPTER 4 84 Figure 2 Relation of AEA concentration with covariates A) Violin plot of log10 transformed AEA concentrations and sex. Each dot represents an individual, the median is marked by a red diamond. The horizontal lines represent the 0.25, 0.5 and 0.75 quantiles. B) Correlation plot of log10 transformed AEA concentration and cigarettes per day. The black line indicates the linear regression line and grey area the 95% confidence interval. Cases are depicted in red triangles and controls in blue circles. r = Pearson’s correlation coefficient. AEA = N-Arachidonoylethanolamine. Plots are based on pre-imputed data and uncorrected.
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