Association of Oxidative Balance Score with the Metabolic Syndrome in a Sample of Iranian Adults

Table 1

Characteristics of the study participants across tertiles of oxidative balance score in Tehranian adults ().

(a)

Characteristics	T1 [16–24] ()	T2 [25–28] ()	T3 [29–39] ()	value
Gender (%)				0.68
Male	38.3%	33.8%	27.8%
Female	30.3%	38%	31.7%
Education (%)				0.18
Illiterate	27.8%	37.5%	34.7%
Under diploma	35%	33.6%	31.4%
Diploma	31.5%	33.8%	34.6%
Educated	33.6%	41.4%	25%
Smoking (%)				0.007
Current	50%	22.7%	27.3%
Former	50%	17.6%	32.4%
Never	31.1%	38.4%	30.6%
Physical activity (MET-min/day)				<0.001
Low	37.4%	35.4%	27.2%
Medium or high^a	24.8%	39%	36.1%

(b)

	Mean	SD	Mean	SD	Mean	SD
Age (y)	44.3	10.1	44.5	10.7	45.3	11.4	0.27
BMI (kg/m^2)	28.4	6.9	27.8	4.9	27.4	4.5	0.04
WC (cm)	93.6	13.1	91.2	11.9	91.4	12.2	0.04
Dietary intake
Energy (kcal/d)	2408	904	2504	1048	2561	906	0.80
Iron (mg/d)	20.2	9.05	20.6	9.44	22.15	8.25	0.016
SFA (mg/d)	25.1	14.8	24.8	17.9	24.6	18.9	0.75
PUFA (mg/d)	17.0	9.4	17.5	13.5	16.8	4.9	0.90
Selenium (μg/d)	0.02	0.04	0.04	0.28	0.03	0.04	0.46
Fiber (g/d)	12.2	4.8	23.9	1.0	34.5	88.4	0.003
β-Carotene (μg/d)	402	336	805	657	1319	838	<0.001
Vitamin D (μg/d)	0.83	1.22	1.80	1.97	3.20	3.45	<0.001
Vitamin E (mg/d)	2.68	1.56	4.44	3.31	5.83	3.00	<0.001
Folate (μg/d)	214	83	333	273	503	335	<0.001
Vitamin C (mg/d)	90	40	144	71	213	76	<0.001

Abbreviations: BMI: body mass index; MET: metabolic equivalent; OBS: oxidative balance score; PUFA: polyunsaturated fatty acid; SFA: saturated fatty acid; T: tertile; WC: waist circumference. Data are presented as a percentage for categorical variables and for continuous variables. The one-way analysis of variance and the chi-square test, respectively, were used for comparison of continuous and categorical variables among tertiles of the OBS. is statistically significant. ^aBecause the number of people with high physical activity was low, we combined them with moderate physical activity.