Table 3.

Multiple linear regression coefficients for association between mining group and PAH levels, controlling for covariates^*.

	Coefficient	Standard error	P<
Three-ring PAHs
Anthracene	−0.78	3.63	0.84
Fluorene	3.22	1.52	0.04
Phenanthrene	35.9	14.7	0.02
Four-ring PAHs
Benz[a]anthracene	17.7	13.2	0.19
Chrysene	3.54	7.89	0.66
Fluoranthene	14.5	5.36	0.01
Pyrene	10.3	3.98	0.02
Five-ring PAHs
Benzo[b]fluoranthene	−7.05	8.85	0.43
Benzo [k] fluoranthene	−0.15	0.81	0.86
∑PAHs	80.6	32.5	0.02

^*Controlling for sex, age, smoking, education, use of coal in the home and summer season.