Table 2.

Spearman rank correlations between exposure to fumes and aerosols of bitumen, urinary metabolites, 8-oxodGuo, and OTM

VariableIndependent variablesPreshift
Postshift
Shift difference*
nrsPnrsPnrsP
Exposure to fumes and aerosols of bitumen (mg/m3)1-OHP (ng/L)650.270.03650.250.05
1-OHP (ng/g crn)650.230.07650.320.01
Sum of five OHPHs (ng/L)650.55<0.0001650.55<0.0001
Sum of five OHPHs (ng/g crn)650.51<0.0001650.68<0.0001
8-OxodGuo/106 dGuo66−0.310.0166−0.100.44
OTM (median)66−0.180.1466−0.270.03
1-OHP (ng/L)Sum of five OHPHs (ng/L)1140.82<0.00011140.72<0.00011130.78<0.0001
8-OxodGuo/106 dGuo113−0.030.721130.010.96111−0.110.27
OTM (median)1130.070.471140.320.0011120.240.01
1-OHP (ng/g crn)Sum of five OHPHs (ng/g crn)1140.61<0.00011140.64<0.00011130.68<0.0001
8-OxodGuo/106 dGuo113−0.020.841130.020.81111−0.110.25
OTM (median)1130.050.571140.320.00041120.180.06
Sum of five OHPHs (ng/L)8-OxodGuo/106 dGuo113−0.010.911130.000.97111−0.050.58
OTM (median)1130.200.031140.270.0041120.090.37
Sum of five OHPHs (ng/g crn)8-OxodGuo/106 dGuo1130.020.831130.000.97111−0.070.49
OTM (median)1130.220.021140.260.011120.060.52
8-OxodGuo/106 dGuoOTM (median)113−0.020.801140.130.18112−0.120.22
  • Abbreviation: crn, creatinine.

  • * Calculated as postshift minus preshift value.