Table 3.

Pearson correlation coefficients (and p values) among urinary measurements observed in roofers

	Post-shift
	1-OHNap	2-OHNap	9-OHPhe	2-OHFlu	1-OHPyr	8-OHdG
Pre-shift
1-OHNap	1.0	0.343 (0.177)	0.457 (0.065)	0.340 (0.182)	0.640 (0.006)	0.492 (0.045)
2-OHNap	0.785 (0.0001)	1.0	0.617 (0.008)	0.715 (0.001)	0.578 (0.015)	0.235 (0.365)
9-OHPhe	0.839 (<0.0001)	0.785 (0.0001)	1.0	0.814 (<0.0001)	0.848 (<0.0001)	0.603 (0.010)
2-OHFlu	0.716 (0.0008)	0.888 (<0.0001)	0.839 (<0.0001)	1.0	0.698 (0.002)	0.401 (0.111)
1-OHPyr	0.772 (0.0002)	0.727 (0.0006)	0.792 (<0.0001)	0.814 (<0.0001)	1.0	0.802 (0.0001)
8-OHdG	0.316 (0.202)	0.030 (0.905)	0.228 (0.362)	−0.004 (0.988)	0.171 (0.497)	1.0

Values in bold represent pre-shift correlations, and values that are not in bold represent post-shift correlations.