Figure 1

Levels of 1-OHP, 8OHdG and reducing species in urine. Concentrations of 1-OHP (a), 8OHdG (b) and reducing capacity (c) in urine samples of workers, presented as a function of their smoking status and time of sampling. Concentrations are expressed as μmol/mol creatinine for 1-OHP, μg/g creatinine for 8OHdG, and μW/g creatinine for the reduced species. Horizontal line in the box plot indicates the median, with 25 and 75% of the values being inside the box. Whiskers correspond to 95% of all the values, and dots to outliers. * indicate a statistically significant difference (p < 0.05).