Fig. 1

DNA glycosylase levels by group. Whisker plots displaying the expression levels of DNA glycosylase transcripts in the blood cells of stable COPD (n = 18) and AECOPD (n = 11) subjects vs. controls (n = 23). Boxes represent the interquartile range extending from the first to third quartiles, with the horizontal line representing the median value. Whiskers or error bars represent the maximum and minimum values, respectively; x in the box shows the mean. P values (unpaired two-tailed Student’s t test) vs. the control or stable COPD group are indicated