Figure 3.
Comparison of geometric means ± standard errors of free and total urinary 8-isoprostane in smokers (free: 460 ± 78.8 pg/mL; total: 704 ± 108 pg/mL) and nonusers (free: 110 ± 24.2 pg/mL; total: 161 ± 38.7 pg/mL).
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