Fig. 3From: Novel biomarker genes which distinguish between smokers and chronic obstructive pulmonary disease patients with machine learning approachExpression value of identified genes in publicly samples. The box plot presents the normalized expression values of the 15 identified genes in publicly available samples for non-smokers (green), smokers (yellow), and chronic obstructive pulmonary disease (COPD) subjects (red). The box plot presents the median (line) and 25th and 75th percentiles (box); the whiskers are the 5th and 95th percentiles; and the outliers are denoted by open circles. One-way ANOVA with subsequent Tukey’s honest significant difference post-hoc analysis revealed differences between NS and SMK or COPD (*p < 0.05) and between SMK and COPD (†p < 0.05). NS, non-smokers; SMK, current smokers; COPD, COPD subjectsBack to article page