Table 1.

Antioxidant biomarkers at baseline according to demographics of the study participants, Beijing 2008 (n=199).

	N	GPx, U/L Mean (SD)	GR, U/L Mean (SD)	GST, U/L Mean (SD)	TAS, mmol/L Mean (SD)
Sex
Female	114	865.90 (153.00)	6.45 (1.51)	15.7 (4.2)	0.90 (0.23)
Male	85	947.70 (130.10)	6.61 (1.58)	15.7 (2.5)	1.17 (0.30)
P value		<0.0001	0.48	0.85	<0.0001
Age
≤40	39	826.67 (142.64)	6.23 (1.61)	14.69 (3.27)	0.95 (0.30)
>40–50	67	902.52 (163.97)	6.59 (1.45)	15.70 (4.02)	0.98 (0.30)
>50	93	930.66 (128.78)	6.59 (1.57)	15.98 (3.27)	1.07 (0.27)
P value		0.0010	0.42	0.16	0.04
Education
Primary & illiterate	66	902.66 (128.0)	6.58 (1.61)	15.21 (3.69)	0.98 (0.27)
Middle School	105	902.35 (168.99)	6.45 (1.48)	15.82 (3.68)	1.01 (0.31)
≥High school	27	889.50 (116.55)	6.65 (1.64)	15.93 (2.71)	1.12 (0.25)
P-value		0.92	0.77	0.50	0.12
Smoking
Nonsmoker	135	886.60 (159.50)	6.52 (1.59)	15.49 (3.92)	0.96 (0.26)
Smoker	64	930.90 (119.50)	6.51 (1.44)	15.92 (2.63)	1.14 (0.32)
P value		0.03	0.97	0.37	<0.0001
Alcohol
Nondrinker	130	890.00 (148.00)	6.43 (1.56)	15.90 (3.93)	0.96 (0.27)
Drinker	67	923.40 (149.50)	6.70 (1.51)	15.14 (2.69)	1.12 (0.31)
P value		0.14	0.25	0.11	0.0005
BMI
<24	131	892.59 (148.01)	6.37 (1.54)	15.46 (3.61)	1.00 (0.27)
24–<28	53	931.80 (152.50)	6.80 (1.36)	15.69 (3.54)	1.04 (0.32)
≥28	15	863.10 (134.78)	6.77 (1.99)	16.92 (3.01)	1.04 (0.38)
P value		0.16	0.18	0.32	0.72