Table 4. Relations of PM_2.5 exposure and particulate PAHs with urinary 1-OHPG by regression models.

	Ln urinary 1-OHPG(µg/g creatinine)
Variables	β	95% CI	p-value
Total workers (N = 144)
Environmental exposurea
PM2.5 (µg/m3)	−0.0003	−0.003 to 0.002	0.819
Environmental exposurea
PM2.5 (µg/m3)	−0.0006	−0.004 to 0.002	0.675
Particulate PAHs (ng/m3)	0.043	0.011 to 0.075	0.010
Nonsmoking workers (N = 117)
Environmental exposureb
PM2.5 (µg/m3)	−0.0007	−0.004 to 0.002	0.626
Environmental exposureb
PM2.5 (µg/m3)	−0.001	−0.004 to 0.002	0.503
Particulate PAHs (ng/m3)	0.056	0.014 to 0.098	0.010

^aAdjusted for age, gender, educational level, smoking habit, season of data collection, and group.

^bAdjusted for age, gender, educational level, season of data collection, and group.