Table 5. Determinants of urinary 1-OHPG, 8-OHdG and DNA strand breaks in nonsmoking workers by mixed models (No^a = 234).

	Ln urinary 1-OHPG (µg/g creatinine)		Ln urinary 8-OHdG (µg/g creatinine)		Ln DNA strand breaks (%)
Variables	β (95% CI)	p-value	β (95% CI)	p-value	β (95% CI)	p-value
Age (year)	0.009 (−0.009 to 0.027)	0.328	0.015 (0.003 to0.026)	0.016	−0.008 (−0.014 to −0.001)	0.019
Gender
Female (reference)
Male	−0.369 (−0.712 to −0.026)	0.035	−0.111 (−0.337 to 0.116)	0.334	0.035 (−0.083 to 0.153)	0.557
Educational level
High school (reference)
College	−0.056 (−0.322 to 0.435)	0.770	0.124 (−0.370 to 0.124)	0.323	0.122 (−0.253 to 0.010)	0.069
Group
Control group (reference)
Exposed group	0.634 (0.228 to 1.040)	0.003	0.379 (0.108 to 0.649)	0.007	0.621 (0.477 to 0.765)	<0.001
Season
Winter (reference)
Spring	0.125 (−0.222 to 0.472)	0.477	−0.256 (−0.483 to −0.029)	0.027	0.023 (−0.097 to 0.143)	0.701
Summer	0.080 (−0.457 to 0.616)	0.769	−0.506 (−0.857 to −0.156)	0.005	0.051 (−0.143 to 0.245)	0.603
Fall	0.083 (−0.385 to 0.550)	0.727	−0.237 (−0.542 to 0.067)	0.125	0.094 (−0.065 to 0.253)	0.242
Ln 1-OHPG (µg/g creatinine)			0.101 (0.014 to 0.187)	0.023	0.007 (−0.036 to 0.051)	0.732
Ln 8-OHdG (µg/g creatinine)					−0.019 (−0.088to 0.050)	0.587

^aAbbreviations: number of observations (No).