Table 5.

Total odds ratio for ever exposed to occupational benzene and to different levels of the mean estimates of environmental benzene.^a

Categories of mean concentrations of environmental benzene	OR for environmental exposure to benzene for an increase across percentiles	Total OR for ever exposed to occupational benzene and to environmental benzene	Total OR for every 10 years of duration of exposure to occupational benzene and to environmental benzene
5th to 25th percentile	2.00	2.60	2.20
25th to 75th percentile	1.45	1.89	1.60
75th to 95th percentile	0.95	1.23	1.04

^aFrom multiplicative models using the same covariables as in model 7 and including occupational exposures to benzene, in separate models, for ever exposed and duration of exposure.