Table 3-1.

Characteristics of subjects by urinary 8-isoprostane (ng/mg creatinine)

Variable	All (n = 677)		Male (n = 293)		Female (n = 384)
	mean ± SE	p	mean ± SE	p	mean ± SE	p
Total	0.58 ± 0.01	—	0.68 ± 0.02	—	0.52 ± 0.02	<0.001**$
Age (year)
<40	0.63 ± 0.02	0.044*	0.74 ± 0.03	0.101	0.56 ± 0.03	0.147
≥40	0.55 ± 0.02		0.64 ± 0.02		0.49 ± 0.03
BMI (kg/m2)
<18.5	0.56 ± 0.04	0.646	0.80 ± 0.09	0.712	0.51 ± 0.05	0.875
18.5–24.9	0.58 ± 0.02		0.68 ± 0.02		0.52 ± 0.02
≥25.0	0.62 ± 0.03		0.68 ± 0.03		0.55 ± 0.05
Smoking
Never	0.51 ± 0.02	<0.001**	0.55 ± 0.03	<0.001**	0.50 ± 0.02	0.032*
Smokers	0.75 ± 0.02		0.79 ± 0.02		0.64 ± 0.04
Alcohol drinking (units/week)
No	0.51 ± 0.03	0.004**	0.67 ± 0.03	0.958	0.46 ± 0.03	0.018*
<20	0.62 ± 0.02		0.69 ± 0.02		0.56 ± 0.02
≥20	0.74 ± 0.09		0.69 ± 0.11		0.99 ± 0.04
Exercise (times/week)
No	0.57 ± 0.02	0.056	0.71 ± 0.03	0.343	0.50 ± 0.02	0.057
1-5	0.63 ± 0.02		0.68 ± 0.02		0.58 ± 0.03
6 or over	0.47 ± 0.08		0.56 ± 0.07		0.34 ± 0.19