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Table 2 Geometric means (and geometric standard deviations) of urinary biomarkers (μg/g creatinine) and of γH2AX (from lymphocytes) in samples collected before and after work on both study days

From: Short-term markers of DNA damage among roofers who work with hot asphalt

Biomarker Monday Thursday
Before (n = 20) After (n = 20) Before (n = 20) After (n = 19)
1-OHNap 13,766.6 (4.3) 24,343.0 (3.2) 17,500.8 (2.8) 18,769.7 (4.5)
2-OHNap 54,176.4 (2.0) 73,130.4 (2.5) 73,130.4 (2.0) 73,130.4 (2.1)
1-OHPyr 706.3 (3.7) 2100.6* (3.0) 1032.8 (4.5) 1790.0 (3.7)
8-OHdG 2186.4 (1.8) 4105.2* (1.4) 2565.7 (1.4) 3866.1* (1.5)
γH2AX (MFI) 1118.8 (1.2) 1224.1* (1.1) 1188.0 (1.1) 1236.4 (1.2)
  1. *p < 0.05 when compared to pre-shift levels within the same day. MFI mean fluorescence intensity