Figure 4
From: A whole blood gene expression-based signature for smoking status
Comparison of gene expression score to cotinine levels in validation set. The y-axis shows the log10 value of cotinine levels in the 180 subject validation set; the horizontal dashed line (−−-) denotes the 10ng/ml threshold used in the AUC analysis. The x-axis shows the GES in the 180 subject validation set; the vertical dashed line denotes the 50% probability threshold used in the AUC analysis. Black circles = non-smokers; red circles = former smokers (> 2 months quit); green circles = recently quit smokers (< 2 months quit); blue circles = current smokers. All smoking categories are self-reported.