Table 4

Occupational exposure to benzene in outdoor and indoor workers: regression analysis

	B^4-150	SE	R²	p Value
Variable^4-151:
Dependent variable: ln benzene exposure (whole study population):
Constant^4-153	−0.593	0.403
Job	0.657	0.092	0.195	0.000
Environmental benzene	0.474	0.148	0.036	0.002
Total			0.231	0.000
Variable^4-152:
Dependent variable: ln benzene exposure (traffic police only):
Constant^4-153	0.518	0.499
Environmental benzene	0.554	0.196	0.048	0.005
Total			0.048	0.005

Stepwise regression analysis: for entry p=0.05.
↵4-150 B=slope of the regression line.
↵4-151 Variables considered: job (traffic voffice police), environmental benzene, season, smoking habits, sex, age.
↵4-152 Variables considered: environmental benzene, season, smoking, sex, age.
↵4-153 Constant=estimated intercept value.