Figure 3.

Basic level (time 0 h) of the antioxidant status in skin for non-smokers (nSm, n = 57), moderate (mSm, n = 18, < 10 cig./day) and strong smokers (sSm, n = 23, ≥10 cig./day), (A) absolute rate constant of radical scavenging capacity, as measured by non-invasive EPR spectroscopy; (B) glutathione (GSH) concentration for nSm (n = 13) and sSm (n = 13), as measured in tape-stripped stratum corneum by fluorimetric assay. The figure contains the results of study A, B and C (basic level (time 0 h), cutaneous antioxidant status); boxplot chart with percentile 25, 75, median (black line), mean (black square) and outlier (black cross), * p ≤ 0.05, ** p ≤ 0.01, *** p ≤ 0.001.