Table 7

Biomarkers of benzene exposure in urban workers: regression analyses

	B^7-150	SE	R²	p Value
Variable^7-151:
Dependent variable: ln blood benzene (after shift):
Constant^7-153	5.057	0.084
ln TWA benzene exposure	0.109	0.046	0.024	0.020
Total			0.024	0.020
Variable^7-152:
Dependent variable: ln TMA (after shift):
Constant^7-153	4.457	0.146
Smoke	0.512	0.146	0.065	0.001
Sex	−0.539	0.156	0.053	0.001
Total			0.118	0.000
Variable^7-152:
Dependent variable: ln S-PMA (after shift):
Constant^7-153	−0.671	0.555
ln blood benzene	0.293	0.102	0.038	0.005
Smoke	0.265	0.093	0.042	0.005
Sex	−0.215	0.100	0.018	0.032
Total			0.098	0.000

Stepwise regression analysis: for entry p=0.05.
↵7-150 B=slope of the regression line.
↵7-151 Variables considered: TWA benzene exposure, job (trafficv office police), smoking, sex, age.
↵7-152 Variables considered: TWA benzene exposure, job, blood benzene, smoking, sex, age.
↵7-153 Constant=estimated intercept value.