Figure 1From: Association of DNA methylation with age, gender, and smoking in an Arab population Q-Q plots for the association between smoking and each methylation site: a) before performing PCA (including age, gender, BMI in the model), inflation coefficient = 1.32; b) before performing PCA (including age, gender, BMI and cell coefficients for monocytes and granulocytes), inflation coefficient = 1.18; and c) after performing PCA and (including age, gender, BMI, monocytes and granulocytes, PC1), inflation coefficient = 1.03. Back to article page