Fig. 3
From: Effects of smoking cessation on biological monitoring markers in urine
Changes in urinary m7Gua (a) and 8-OHdG (b) levels by smoking cessation in the subjects with continuous decreases in NNAL levels throughout the smoking cessation period. Horizontal bars indicate median values. Group 3: The subjects participated in the quit-smoking program up to 2 weeks (n = 37, Wilcoxon signed-rank test). Group 4: The subjects participated in the quit-smoking program up to 8 weeks (n = 12, Friedman’s test followed by Dunn’s multiple comparisons test). * p < 0.05; ** p < 0.01